1. Unboxing and Basic Familiarization with the Equipment

1.1 Unboxing and Inspection

When unpacking the device, handle it gently to avoid scratching the casing with sharp objects. After unboxing, first inspect the exterior of the device to ensure there is no visible deformation or dents, and that the buttons are not damaged or loose. If you notice any abnormalities with the device or its accessories, do not turn it on. Please contact us immediately.

1.2 System Configuration and Overview

1.2.1 Core Hardware Components

Note: The table below lists the core hardware components of the entire system. The equipment you purchased may include only some of these components; please keep this in mind when following the instructions in this manual.

Component Name	Model	Core Features
Goniophotomoeter Main Unit	LSG-1890B	Used in conjunction with a photometric probe to measure photometric parameters and their spatial distribution, such as luminous flux and light distribution curves.
Near-field photometric probe	PM400C (N)	Suitable for standard darkrooms, such as those around 10 meters in size
Far-Field Photometric Probe	PM400C (F)	Optional. Suitable for extra-long darkrooms, such as those longer than 20 meters.
Standard Light	SLS-150W	Used to calibrate the darkroom (luminance sensor)
E27 Fixture	/	For C-Gamma testing; suitable for incandescent bulbs
Cross Clamp		For C-Gamma testing; suitable for other indoor and outdoor lighting fixtures
Square Clamp		For B-Beta testing; suitable for floodlights
Cross-Line Laser		Used during installation and commissioning; used during calibration and testing to determine the position and orientation of the standard lamp and the sample luminaire
Cabinet	CASE-19	Used to house angle controllers, power meters, and DC and AC power supplies. Includes a power strip, an RS485 communication module, and more.
Angle Controller	RT-200C	The angle at which the Goniophotomoeter is positioned for display and control. Generally, no manual adjustment is required; control is handled by the software.
Power Meter	LS Series	Measure electrical parameters such as voltage, current, power, and power factor of the sample
DC Power Supply	DC Series	Provides a stable DC power supply for DC samples, standard lamps, and auxiliary lamps
AC Power	LSP Series	Provides a stable, pure sine-wave AC power supply for AC samples

1.2.2 Software, manuals, certificates, etc.

At the time of shipment, a download link containing all the documents was sent via email. Please download them promptly. If you missed the email, you can contact us to request a new download link.

Includes software, user manuals, warranty cards, standard lamp calibration certificates, and other important documents, as well as other relevant documents.

1.4 Measurement Parameters

Illuminance data, illuminance distribution, area luminous flux, luminaire efficiency, luminance distribution (optional), utilization factor, luminance limit curve, glare rating, isophote curves, maximum allowable height-to-distance ratio, luminaire curve vs. illumination area, isointensity curves, effective beam angle, EEI, UGR, PAR, PPF, and PPFD spatial distribution tests, etc.

2. Important Notes

2.1 Electrical Safety

The system must be connected to a stable AC power source rated at 220 V ±5% with a frequency of 50 Hz or 60 Hz. Ensure proper grounding with a grounding resistance of ≤4 Ω. Do not use the equipment if the power connections are loose or the cables are damaged.

2.2 Environmental Safety

When using the optical darkroom, the ambient temperature must be maintained at 25±1°C, and the relative humidity must be maintained between 10% and 65% RH;

Both the control room and the darkroom must be kept dry, well-ventilated, dust-free, and free of corrosive gases;

Avoid placing the device near strong magnetic or electric fields; it must be placed on a level, sturdy surface.

2.3 Darkroom Operating Procedures

2.3.1 Darkroom Description

Please confirm that the darkroom has been constructed exactly according to the darkroom drawings we provided. If there are any discrepancies in the actual dimensions, please inform us before installing and commissioning the equipment so that we can adjust the plan, ensuring that the installation and commissioning proceed smoothly and that the test results are accurate;

The interior of the darkroom must be completely painted matte black—that is, a non-reflective pure black—including all walls, ceilings, floors, partitions, doors, and so on. A small number of components, such as lighting fixtures, air conditioning units, and power switches, may not be painted black, provided they do not appear in the optical path between the Goniophotomoeter’s main unit and the photometric probe;

Once the equipment has been installed and commissioned, do not move any of the hardware components inside the darkroom, including the main unit base, the photometer probe base, the photometer probe orientation, and the cross-laser base. Doing so may result in inaccurate test results.

2.3.2 Precautions for Using the Darkroom

Remove your shoes or put on shoe covers when entering the darkroom to prevent dust from being brought in;

The sample luminaire must be securely mounted to prevent it from falling and damaging the Goniophotomoeter during testing;

Do not place any objects on the main unit of the Goniophotomoeter, and do not place any objects within the Goniophotomoeter’s rotation range;

During testing, the darkroom must remain sealed to prevent external light from interfering with the test results.

2.3.3 Precautions When the Darkroom Is Not in Use

Keep the darkroom closed; unauthorized persons are not allowed to enter; prevent dust from entering the darkroom.

2.4 Standard Lamp Operating Procedures

The standard lamp has a lifespan of one year and is used for calibrating the photometer probe in a darkroom during installation and commissioning;

If your laboratory is required to calibrate its darkroom annually, you may purchase a new standard lamp;

The standard lamp is hot immediately after use; do not touch it. Allow it to cool for 10 minutes before returning it to the lamp case;

The standard lamp used in the darkroom is a directional standard lamp, and its direction is controlled by its bracket. Do not remove the bulb from its bracket; doing so will render the standard lamp inoperable.

2.5 Other

For matters not covered in this manual, please proceed with caution or contact us.

3. Hardware Assembly

3.1 Cabinet Equipment Assembly

3.1.1 Introduction to the Cabinet

Place the cabinet on a level, sturdy workbench, leaving sufficient space for operation.

Number	Note
①	Wiring Diagram: Please assemble the equipment according to the wiring diagram.
②	Power distribution panel, used to connect the power cords of all devices inside the cabinet
③	Cooling fan power cord: Please connect it to the power strip inside the cabinet.
④	RS-485 Communication Box, used to connect all devices via an RS-485 communication cable
⑤	Please connect the power adapter for the RS485 communication box to the power strip inside the cabinet.
⑥	The USB cable for the RS485 communication box must be connected to the computer.
⑦	RT-200C Angle Controller Wiring
⑧	LS Series Power Meter Wiring
⑨	DC Power Connection
⑩	AC Power Wiring
⑪	The main power cable for the cabinet, which supplies power to all equipment inside the cabinet, should be routed out through cable opening ② and connected to the power source only after all equipment has been fully assembled.
⑫	Cable opening—the main power cord can be routed through here. Note: The main power cord plug is a Chinese standard plug; you may need to provide your own power adapter.

Figure 1

3.1.2 RT-200C Installation

For now, all you need to do is plug it in.

Figure 2

3.1.3 Installation of the LS Power Meter

Number	Note
①	Connected via an RS-485 communication cable; the other end is connected to the RS-485 communication box inside the cabinet.
②	The power cord is connected; the other end is already connected to the power distribution panel inside the cabinet.
③	V1 test lead, connected to the red terminal of the power meter’s voltage V
④	V2 test lead, connected to the black terminal of the power meter’s voltage V
⑤	A1 test lead, connected to the red terminal of the power meter’s current A
⑥	A2 test lead, connected to the black terminal for current A on the power meter

Figure 3

3.1.4 DC Power Supply Installation

Number	Note
①	Connected via an RS-485 communication cable; the other end is already connected to the RS-485 communication box inside the cabinet.
②	Connect the DC power output wires, making sure to match the positive and negative terminals.
③	The power cord is connected; the other end is already connected to the power strip inside the cabinet.

Figure 4

3.1.5 AC Power Installation

Please locate the following AC power output cable in the accessories:

Figure 5

Number	Note
①	Connected via an RS485 communication cable; the other end is already connected to the RS485 communication box inside the cabinet.
②	The power cord is connected; the other end is already connected to the power strip inside the cabinet.
③	Run the AC power output cable through cable opening ④ and connect it to position ⑤.
④	Wire hole
⑤	AC power output cable: Pass it through cable hole ④ and connect it to position ③.

Figure 6

Figure 7

3.2 Installation of The Goniophotomoeter Main Unit and Goniophotomoeter Probe

3.2.1 Host Assembly

The same number is engraved on the main unit’s base tapered sleeve ① and the corresponding position on the main unit ②. Rotate the tapered sleeve until the two numbers are aligned, then secure the tapered sleeve using the hex socket screws provided as standard.

Figure 8

Figure 9

Remove the screws securing the dust cover on the turntable, and pull the dust cover off.

Figure 10

Use a forklift to lift the turntable; since the turntable is quite heavy, three to four people can also carefully lift it. Align the dust cover on the turntable with the terminal block on the base, then slowly lower the turntable onto the base. Hold the terminal block in place with your hand so that it slides into the turntable along with the tapered sleeve, preventing the terminal block from being crushed by the turntable.

Figure 11

To fine-tune the turntable’s direction, follow these steps in the order listed below.

Number	Note
①	Align the six screw holes on the turntable with the six screw holes on the base, and use the standard hex screws and washers provided to secure the turntable to the base . Note: Be sure to use all the standard washers; otherwise, the screws may not fit properly, which could damage the equipment during turntable rotation.
②	Plug the base terminal block into the corresponding terminal block socket on the turntable.
③	Then put the dust cover back in place

Figure 12

Figure 13

The four feet on the bottom of the unit are height-adjustable.

Number	Note
①	Turn the screw at the bottom to raise the leg until it is off the ground.
②	At the same time, make sure the top screw isn’t pressing against anything; you can unscrew it slightly.

Figure 14

Position the goniophotomoeter in the correct location according to the darkroom blueprints. Align the four sides of the base as closely as possible with the darkroom walls. Then remove the auxiliary arm.

Figure 15

Next, please turn all four legs of the Goniophotomoeter until they are in contact with the floor.

3.2.2 Assembly of the Photometric Probe and Probe Holder

Take, for example, a darkroom with only one photometer.

Assemble the photometric probe and probe mount, and position them in the appropriate locations according to the darkroom drawings; there is no need to secure them with screws for now.

Figure 16

Figure 17

3.2.3 System Wiring

Number	Note
①	The four terminal blocks ①on the cabinet are connected to the Goniophotomoeter⑩; simply match them one-to-one based on the numbers.
②	The two terminals connect to the terminal block inside the cabinet and are used to supply power to all equipment in the darkroom, including the Goniophotomoeter and photometric probes. This allows for convenient control of all darkroom equipment via the cabinet’s power switch. Note: The darkroom equipment can also be powered directly from the mains.
③	Cabinet grounding terminal: Please connect it to ground using a wire.
④	Cabinet power cord, connected to a 220V, 50/60 Hz power source
⑤	Power Cord for the Main Unit of the Goniophotomoeter
⑥	Connect the ground terminal of the Goniophotomoeter to the ground using a wire.
⑦	This is a one-to-two communication cable; one end of the RS-485 cable connects to the RS-485 communication box inside the cabinet, and the other end connects to position ⑭ on the back of the RT-200C.
⑧	Photometer probe trigger wire; connect to probe ⑬. When only one probe is installed, the default setting is near-field (N).
⑨	If you have only one photometer in your darkroom, there is no need to connect the far-field (F) sensor.
⑩	The four terminal blocks ⑩on the Goniophotomoeter are connected to the cabinet①; simply match them one-to-one according to the numbers.
⑪	Power Adapter for Photometric Probe
⑫	RS-485 communication cable for the photometric probe; the other end connects to the RS-485 communication box inside the cabinet
⑬	Photometric probe trigger cable, connected to the main unit ⑧of the Goniophotomoeter
⑭	RT-200C communication cable, with the other end connected to the main⑦ unit of the Goniophotomoeter

Figure 18

Figure 19

Figure 20

Figure 21

4. Software Installation and Configuration

4.1 Software and Driver Installation

4.1.1 Software Runtime Environment

System Requirements: Windows 7/8/10/11 (32-bit/64-bit); the computer must have at least one USB port.

4.1.2 Installation

Number	Note
①	LSG Series Goniophotomoeter Software—Double-click to install
②	This APK file can be copied to an Android phone for installation. The app is intended solely for rotating the Goniophotomoeter and cannot be used for testing. Since the software includes all the app’s features, this manual uses the software as an example for operation.
③	RS485 Communication Box Driver—Please double-click to install

Figure 27

4.1.3 Exception Handling

If your antivirus software or the Windows Firewall flags a file as suspicious during the software installation process, please temporarily disable the antivirus software or the Windows Firewall and try installing the software again.

If the software fails to open when you double-click its icon after a successful installation, please check whether you are logged in to your computer with an administrator account. If the software still does not open after logging in with an administrator account, right-click the software icon to open its Properties window. On the Compatibility tab, check the box next to “Run this program as an administrator,” click “Apply,” and then double-click the icon again to open the software.

Figure 28

4.2 Software Settings

First, turn on the cabinet’s power switch, then power on all system devices, including all equipment inside the cabinet, the Goniophotomoeter main unit, and the photometric probes. Double-click to launch the software. The first time you run the software, it will automatically open the system configuration interface. Select the correct model for each device you have purchased.

Number	Note
①	To select a goniophotomoeter model, click the drop-down list on the right. The model you purchased is the LSG-1890B.
②	Near-field photometer probe; select photometer probe model PM400C
③	Far-field photometric probe—if you have not purchased one, please select “Not Installed.”
④	The LSG-1890B does not include a near-field Spectroradiometer; please select “Not Installed.”
⑤	AC power supply models are generally from the LSP Series
⑥	DC power supply models are generally designated as the DC Series
⑦	Power meter model: The model number is printed on the front panel of the power meter. Please check it and select the appropriate model.
⑧	Once you have selected all the correct models, click “Auto-detect Port.”
⑨	After the search for all ports is complete, click “OK” to save and exit.

Figure 29

Note: If a communication error occurs during the automatic port search, please read the error message carefully, check whether the corresponding device is powered on, and verify that the RS485 communication cable is properly connected. Once you have confirmed these points, click “Automatic Port Search” again until communication is established with all devices.

After clicking OK, the software automatically opens the database file save dialog. From then on, all test reports will be automatically saved in this database file.

Number	Note
①	Please select the path where you want to save the database file. Please do not save it to the desktop or inside the Desktop folder.
②	Enter the file name
③	Just click “Save”

Figure 30

5. Calibration of darkroom equipment (Each step must be performed carefully and thoroughly; otherwise, calibration data may be inaccurate and test results may be abnormal.)

5.1 Horizontal Commissioning of the Main Unit

5.1.1 Laser Ready

There is a laser switch on the back of the goniophotomoeter’s main arm. When you turn on the line laser switch, you will see a red line laser beam emitted directly in front of the main arm.

Figure 31

Find the crosshair laser device and tripod.

Figure 32

Remove the cross-line laser and the batteries. Insert the batteries into the cross-line laser. The power switch is located on the side of the device. The device turns on when the switch is set to the “unlocked” position.

Number	Note
①	Power switch: Turn it to the “Unlock” position to turn on the power.
②	VH refers to vertical and horizontal laser switches, respectively.

Figure 33

Mount the crosshair laser onto the tripod.

Note: The cross-line laser is self-leveling. If the cross-line laser is not self-leveled, an audible alarm will sound. This may be due to an uneven surface or a tripod that is not properly set up. Please ensure that the cross-line laser remains self-leveled at all times during use.

5.1.2 Steps for Horizontal Commissioning of the Host Machine

According to the darkroom drawings, the center height of the LSG-1890B goniophotomoeter is 1510 mm. Using a tripod, adjust the height of the horizontal laser beam from the crosshair laser to 1510 mm. At this height, the horizontal laser beam should pass through the center of all light-transmitting holes in the darkroom partition.

Figure 34

Please note: Do not place any objects on the Goniophotomoeter or within its rotation range to prevent damage to the equipment during rotation.

Open the software.

Number	Note
①	Click to switch angle modes
②	Click ① to display the C-Gamma angle here instead of the B-Beta angle.
③	Then click to open the angle control interface

Figure 35

Click the continuous rotation button for any direction. The Gamma axis of the Goniophotomoeter will then begin to rotate continuously.

Figure 36

At this point, observe the horizontal laser beams emitted by the single-line and cross-line lasers from the main axis of the Goniophotomoeter.

Figure 37

Then, using an appropriate wrench, raise the goniophotomoeter and level it by adjusting the height of its four legs. The final result of the calibration: Regardless of the Gamma angle of the goniophotomoeter, its straight laser beam perfectly aligns with the horizontal laser beam, as shown in the figure below.

Figure 38

You’ll need plenty of patience to complete this step. Once adjusted, make sure all four legs of the main unit are firmly on the ground. Then click the “Stop” button on the software’s angle control interface to stop the Goniophotomoeter from rotating. Next, lock the four legs of the Goniophotomoeter in place using the screws at the top. Once the position and level of the Goniophotomoeter main unit have been properly adjusted, do not move it again, as this will cause deviations in the test results.

5.2 Calibration of the Photometric Probe

5.2.1 Calibration of the Photometric Probe at the 0-Degree Position

Number	Note
①	Enter 0
②	Click any rotation direction to rotate the Gamma axis back to the 0-degree position.

Figure 39

Verify that the single-line laser beam is passing through the exact horizontal center of the last partition at this point.

Figure 40

If not, follow the steps below.

Number	Note
①	Please enter a small angle value here based on the actual situation, such as 1, 0.1, 0.05, etc.
②	Select a rotation direction and rotate the Gamma axis until the single-line laser passes through the exact center of the last partition horizontally.
③	Click “Set to 0 Degrees” to set the current position of the Gamma axis on the near-field luminance probe to 0 degrees. The password is LISUNGROUP.

Figure 40.1

Note 1: After setting the Gamma axis of the near-field photometer to 0 degrees, do not arbitrarily set it to 0 degrees again, as this will cause deviations in the test results.

Note 2: Definition of the Gamma angle for a goniophotomoeter. The direction directly facing the photometer probe is defined as 0 degrees/360 degrees. When rotating clockwise, the angle value increases from 0 degrees to 360 degrees; when rotating counterclockwise, the angle value decreases from 360 degrees to 0 degrees. Since angle notation may vary, -90 degrees and 270 degrees correspond to the same position.

5.2.2 Mounting the Photometric Probe

Rotate the light sensor’s lens cover counterclockwise and remove it.

Figure 41

The standard lamp packaging box contains a small mirror.

Figure 42

Figure 43

Remove the small reflector and attach it to the probe.

Figure 44

At this point, the Gamma axis of the near-field photometer is still at the 0-degree position. Slightly move the probe base and adjust the screws at points ① and ② to adjust the probe’s height and orientation. Position the probe so that the straight laser beam coming from the main axis hits the exact center of the mirror, and ensure that the reflected beam travels back along the same path.

Figure 45

Then secure the probe bracket base to the floor with screws.

Figure 46

Once secured, you may need to make slight adjustments to the probe’s height and orientation so that the straight laser beam continues to hit the exact center of the reflector and the reflected beam returns along the same path. After calibration is complete, ensure that all screws are tightened. Then remove the reflector and reinstall the light probe’s light shield.

Note: Once the probe’s position and orientation have been set, do not adjust them, as doing so may cause the test data to be inaccurate.

You can secure the photometer probe’s power adapter to the probe mount as shown in the figure below to protect the probe’s power jack.

Figure 47

5.3 Cross-Line Laser Installation

Finally, the crosshair laser must be mounted on the side wall of the darkroom. Depending on the specific layout of each darkroom, the crosshair laser can be mounted on either the left or right wall. Take the darkroom layout shown in the figure below as an example.

Figure 52

Go to the angle control screen.

Number	Note
①	Enter 90 (if the installation position of the crosshair laser in your darkroom blueprint is different, enter -90)
②	Click to rotate the gamma axis to a 90-degree position, so that the main-axis laser is directly aligned with the position where the crosshair laser is installed.

Figure 53

Secure the crosshair laser to the triangular mount we provide.

Figure 54

Turn on the crosshair laser and use the direction of the single-line laser to roughly determine the position of the crosshair laser.

Figure 55

Fine-Tune the Position of the Crosshair Laser: The centerline of the straight laser should be perfectly aligned with the centerline of the crosshair laser. You can verify and adjust the position using the following method. Place a sheet of white paper at the exit of the cross-shaped laser and at the exit of the single-line laser. If the centerline of the single-line laser aligns with the centerline of the cross-shaped laser at both locations, you can confirm that the position and orientation of the cross-shaped laser are correct.

Figure 56

Figure 57

Next, secure the cross-laser tripod to the wall using screws. Once secured, you can still loosen the screws if necessary to make slight adjustments to the cross-laser in both the horizontal and vertical directions, ensuring it remains properly aligned. After calibration is complete, all screws should be tightened securely.

Figure 58

Then rotate the Gamma axis back to the 0-degree position. The cross-shaped laser beam is projected onto the opposite wall. You can use this to create a permanent mark. That is, when the cross-shaped laser beam is projected in this direction, it indicates the horizontal and vertical center positions of the Goniophotomoeter. This mark is needed for both calibration and testing.

Figure 59

Installation and commissioning are complete. Turn off the line laser on the main shaft of the Goniophotomoeter.

5.4 Cleaning

You may shut down all equipment. When doing so, first turn off the power switch on each individual device, and then turn off the main power switch for the cabinet. Next, thoroughly clean the darkroom and control room. To prevent dust from entering the equipment, cover the devices with dust-proof cloths before cleaning. After cleaning, turn all equipment back on and continue with the calibration and testing procedures.

Note: Keep the darkroom as dust-free as possible during use.

6. Calibration

6.1 Installation and Commissioning of Standard Lamps

6.1.1 Installation of Standard Lamps

First, turn on the crosshair laser on the wall and rotate it to ensure that it is aimed at the mark on the opposite wall.

Open the Standard Lamp box.

Figure 60

Then assemble the standard lamp bracket as shown in the figure below.

Figure 61

The main shaft of the Goniophotomoeter should still be aligned with the photometric probe, i.e., the probe’s 0-degree position. Locate the calibration rod and install it at the center of the Goniophotomoeter. Then remove the top section.

Figure 62

Please follow the instructions below to connect the wires.

Number	Note
①	The main shaft of the goniophotomoeter has four terminals for connecting the power cables and sampling cables of the standard lamp and sample luminaire. Use short wires to bridge the red and yellow terminals together, and the black and blue terminals together.
②	Connect the power cord of the standard lamp/sample fixture to the red and blue terminals on the main shaft.

Figure 63

6.1.2 Calibration of the Standard Light Direction

Number	Note
①	Loosen the screw here to adjust the height of the standard lamp.
②	There are three screws here that allow you to adjust the pitch of the standard lamp.

Figure 64

The standard lamp should be adjusted so that the cross-shaped laser beam is directed at the center of the small mirror, and the horizontal and vertical laser beams reflected from the mirror coincide exactly with the original cross-shaped laser beam.

Figure 65

Based on our experience, follow these steps for calibration: First, adjust the height of the standard lamp to the appropriate position. The vertical reflected laser can be calibrated by rotating the calibration target, while the horizontal reflected laser can be calibrated by adjusting the pitch of the standard lamp. After calibration, the center height of the standard lamp may change, requiring you to readjust its height. Continue the reflection adjustment until the cross-shaped laser beam is projected onto the center of the small mirror, and the reflected horizontal and vertical laser beams perfectly align with the original cross-shaped laser beam.

Once the standard lamp is properly aligned, carefully remove the small reflector, taking care not to alter the alignment of the standard lamp during removal. Then turn off the cross-line laser.

6.2 Calibration of the Photometric Probe

All standard lamps are constant-current DC light sources. Set the cabinet’s AC/DC switch to DC.

Figure 66

Open the software angle controller.

Number	Note
①	Enter -90
②	Click to rotate the Gamma axis to the -90-degree position (if the crosshair laser is installed in a different position on your darkroom drawing, you will need to rotate it to the 90-degree position).

Figure 66.1

Align the round hole in the standard lamp mount so that it faces the photometric probe.

Figure 67

Turn on the calibration lamp and enter the calibration interface.

Number	Note
①	Select a DC Power Supply
②	The standard lamp is a constant-current light source. Select CC (constant-current mode) and enter the reference voltage and rated current as specified in the standard lamp certificate; typically, these are 30 V and 6.1 A.
③	Click to turn on the standard lamp and turn off all other lights in the darkroom. The standard lamp takes 15 minutes to reach a steady state.
④	Once the standard lamp has stabilized, click to enter the photometer calibration interface.

Figure 68

Close the darkroom door and make sure that all light sources in the darkroom are turned off, except for the standard lamp.

Number	Note
①	Selecting a Near-Field Photometric Probe
②	Luminous flux calibration—our software includes this option, but current standard practices require the use of luminous intensity calibration, and the standard lamps included in our standard configuration are also luminous intensity standard lamps. Therefore, there is no need to use luminous flux calibration at this time.
③	Light Intensity Calibration Method
④	Refer to the standard lamp calibration certificate and enter its calibrated luminous intensity value.
⑤	Click to Start
⑥	The software will automatically calculate the test distance.
⑦	To verify the results, click “Check,” and the software will display the current measured light intensity value. The measured light intensity value should match the calibrated light intensity value.
⑧	Click “OK” to save and exit.

Figure 69

Note: The test distance is the distance from the center of the Goniophotomoeter to the surface of the photometric probe. The distance calculated by the software should be close to the actual distance; an error of 1% or less is considered normal. If the error is too large, please refer to Section 2.3.1 to verify that the darkroom is functioning properly, and refer to Chapter 5 to review the calibration steps.

After calibration is complete, you can turn off the standard lamp using the software. Since the standard lamp becomes quite hot during use, wait for it to cool down before placing it back in its packaging for safe storage. Remove the calibration rod and store it safely.

6.3 Calibration and Maintenance

No changes in the darkroom	If there have been no changes to the computer, recalibration is not necessary.
	No changes were made to the computer; simply unplug and replug the communication cable or reinstall the Goniophotomoeter software. No recalibration is necessary.
	If you switch to a new computer or reinstall the operating system, there is no need to recalibrate; simply enter the previous test distance and save it.
Changes in the Darkroom	The structure of the darkroom remains unchanged; however, after prolonged use, the interior paint may fade or peel. Depending on how well you maintain the darkroom and the level of accuracy you require for your test results, you may repaint the darkroom periodically. After repainting, the darkroom must be recalibrated.
	There has been a change in the darkroom configuration, so recalibration is required.

7. Preparations Before Testing

7.1 Lamp Selection and Aging

Select representative luminaires for testing that comply with national or corporate standards; new luminaires must undergo aging treatment (for LED luminaires, a 24-hour aging period is recommended);

Check that the light fixture has no visible damage, that the internal wiring is properly connected, and clean any stains from the surface of the fixture.

7.2 Introduction to Test Mode

C-Gamma Mode: Suitable for most lighting fixtures, such as streetlights, downlights, panel lights, and plant grow lights.

Figure 74

Beta Mode: Suitable for spotlights, floodlights, and similar fixtures; requires installation of an auxiliary arm.

Figure 75

Alpha Mode: Suitable for automotive lights and signal lights.

Figure 76

Note: The LSG-1890BCCD can perform C-Gamma and B-Beta tests. For A-Alpha testing, a Type A goniophotomoeter is required; please contact us if needed.

8. C-Gamma Test

8.1 Installing and Turning On the Lights

8.1.1 Light Fixture Installation

We have two C-Gamma test fixtures; this procedure uses the cross-shaped fixture as an example.

Number	Note
①	Large cross-shaped clamps are used for various types of lighting fixtures
②	E27 Fixture for Testing Globe Bulbs

Figure 77

Attach the fixture to the Goniophotomoeter. Turn on the wall-mounted cross-line laser and verify that the cross-line laser is projected accurately onto the markings made on the opposite wall.

Figure 78

On the angle control interface, select the near-field photometric probe. Rotate the Gamma axis 90 degrees so that the crosshair laser points directly at the center of the crosshair fixture. Mount the lamp under test onto the crosshair fixture. Adjust the lamp’s position so that the crosshair laser is centered on the light-emitting surface of the lamp under test, and the light-emitting surface is parallel to the crosshair fixture.

Figure 79

Then rotate the Gamma axis back to 0 degrees. Turn the dial here.

Figure 80

Align the light-emitting surface of the fixture with the vertical laser beam of the crosshair.

Figure 81

Caution is required when installing directional luminaires. When the angle of the C-plane on the Goniophotomoeter is 0 degrees, according to streetlight installation standards, the light pole should point directly upward, as shown in the figure below.

Figure 81.1

When the angle of the C-plane on the goniophotomoeter is 0 degrees, the strip light should be installed vertically in accordance with industry standards, as shown in the figure below.

Figure 81.2

8.1.1 Turning on the Lights

Connect the power cord to the luminaire under test. The connection method for the luminaire under test is the same as that for the standard luminaire; refer to Section 6.1.1.

Adjust the cabinet switch according to the parameters of the luminaire being tested.

Number	Note
①	If the sample luminaire is AC-powered, switch to the AC setting; if it is DC-powered, switch to the DC setting.
②	Internal/External Sampling Switch for Electrical Parameters. External sampling uses a four-wire configuration and provides more accurate voltage readings. Unless otherwise specified, please set this switch to “External Sampling”; no further adjustments are necessary.

Figure 82

If the sample luminaire is AC-powered.

Number	Note
①	Select AC Power
②	Based on the sample parameters, enter the correct voltage and frequency.

Figure 83

If the sample luminaire is DC-powered.

Number	Note
①	Select a DC Power Supply
②	Based on the sample parameters, enter the correct voltage and current.
③	Select the output mode: CC stands for constant current, and CV stands for constant voltage. If you select constant current, you need to enter the sample’s rated current value; for the voltage, simply enter the maximum output voltage of this DC power supply. If you select constant voltage, enter the sample’s rated voltage and the DC power supply’s maximum output current. Note: If your DC power supply model is DC3010, its maximum output voltage is 30V and its maximum output current is 10A.

Figure 84

The software offers two methods for turning the sample lamp on and off, and users can choose between them.

Number	Note
①	If you check the “Auto Turn On” and “Auto Turn Off” options, the software will automatically power on the sample according to the selected power source and the entered electrical parameters when the test begins, and will automatically cut off the sample’s power when the test ends.
②	If the “Auto On” and “Auto Off” options are not checked, you can still click this button; the software will illuminate the sample based on the selected power source and the entered electrical parameters. Clicking this button again will cut off the power to the sample.

Figure 85

8.2 Preheating Parameter Settings

Number	Note
①	If you check the “Preheat” box, the software will preheat the luminaires according to the specified preheat parameters when the test begins, and the test will start automatically once preheating is complete. If you do not check the “Preheat” box, the software will start the test immediately.
②	Preheating Parameter Settings

Figure 86

Click “Preheat Parameter Settings.”

Number	Note
①	Warm-up Duration Setting: The purpose of the warm-up is to allow the light fixture to remain on for a period of time until its luminous and color parameters stabilize, after which the test proceeds automatically.
②	Sampling interval: The software automatically samples data at the set interval throughout the entire warm-up period to obtain real-time data. We recommend setting this to 5 seconds or longer.
③	If checked, the test will automatically skip the remaining warm-up time and proceed once the light fixture has reached a stable state; if unchecked, the test will begin only after the warm-up period has been completed according to the set duration.
④	Definition of a luminaire’s steady-state condition. If the values are set to 20 and 0.5%, the luminaire is considered to be in a steady state if the parameter has not varied by more than 0.5% over the past 20 minutes.
⑤	You can select which parameters the software should use to determine whether a light fixture is stable: optical parameters, electrical parameters
⑥	The software will save the change curves for the selected parameters during the warm-up period in the test report.
⑦	Once you’ve finished configuring the settings, click OK to save and exit.

Figure 87

8.3 Configure Test Parameters and Start the Test

Click “Start Test.”

Figure 88

Go to the test parameter settings screen.

Number	Note
①	Lighting fixture types: indoor lights, outdoor lights, or plant grow lights—these three types of lighting fixtures are subject to C-Gamma testing.
②	Select whether the luminaire is symmetrical or asymmetrical. Unless there are specific requirements, select the first option (asymmetrical) regardless of whether the luminaire being tested is symmetrical or not (to obtain the luminaire’s actual data).
③	C-plane angle range: Select 0 to 180 degrees; no modification is needed. For data ranging from 180 to 360 degrees, the software will automatically convert the C-plane angle intervals. Symmetrical luminaires, such as indoor lights, can use a larger interval (e.g., 30 degrees), while asymmetrical luminaires, such as streetlights, can use a smaller interval (e.g., 10 degrees). The smaller the angle interval, the higher the test accuracy, but the longer the test will take. If time permits, we recommend selecting a smaller angle interval.
④	Gamma plane angle range: If the sample’s light irradiation angle exceeds 180 degrees (e.g., incandescent bulbs), select -180 degrees to 180 degrees; if the sample’s light irradiation angle is less than 180 degrees (e.g., panel lights), you may select a Gamma plane angle interval ranging from -90 degrees to 90 degrees. Unless there are special requirements, a 1-degree interval is sufficient. The specific angle interval selected here has no effect on test speed.
⑤	If the system has multiple photometric probes, please select the one you want to use.
⑥	For standard luminaires undergoing standard testing, select “Normal Speed”; if the luminaire being tested has an extremely narrow beam angle, select “Slow Speed” to obtain more accurate test results; for expedited testing, select “Fast Speed.”
⑦	Fixed Range: If you are consistently measuring the same type of light fixture and the luminous intensity data does not vary significantly, you can check this box to save time. If you have ample time, or if you frequently test lamps with different luminous intensities, we recommend leaving this box unchecked; in this case, the photometric probe will automatically select the appropriate range for each lamp and enter continuous scanning mode. This is suitable when the angular interval of the Gamma plane is between -180 degrees and 180 degrees. During the test, when the Gamma angle approaches ±180 degrees, simultaneously rotating the C-axis to the next scanning position—that is, the Gamma axis rotates continuously without stopping to save time. If you have ample time, we recommend leaving this option unchecked.
⑧	To set the monitoring angle during lamp warm-up, simply set it to (0, 0).
⑨	Normalization refers to the decision of whether to apply a uniform value to the first row of data in the luminous intensity table of a test report; certain standards, such as the U. S. streetlight standard, may require you to perform a similar adjustment. There are three options: no normalization, normalization to the maximum value (which will slightly increase the luminaire’s total luminous flux), and normalization to the average value (which leaves the luminous flux essentially unchanged).
⑩	If you need to remove all stray light outside a specific angle, check this box and enter the desired angle . For example, if you check this option and enter 60, the data outside ±60 degrees of the luminaire’s gamma plane will automatically be set to 0.
⑪	Enter the number of light sources in the luminaire and the rated luminous flux of each light source. If you do not know these values, you may leave them blank; this will not affect the test results.
⑫	Enter the dimensions of the sample’s light-emitting surface. For indoor lighting fixtures, the software requires this data to calculate the luminance limit curve, UGR, and other parameters.
⑬	Enter information about the sample light fixture
⑭	Enter the temperature and humidity of the test environment (i.e., the darkroom)
⑮	Click OK to go to the warm-up screen, or go to the test screen.

Figure 89

Then wait for the software testing to finish.

9. B-Beta Testing

9.1 Install and Turn On the Lights

9.1.1 Lighting Fixture Installation

Turn on the crosshair laser and make sure it is still shining on the mark you made on the opposite wall.

Find the square B-Beta test fixture.

Figure 92

When performing the B-Beta test, reattach the Goniophotomoeter’s auxiliary arm. Then, install the B-Beta fixture vertically as shown in the figure.

Figure 93

Number	Note
①	Click to switch to the angle display mode
②	Click ① to display the B-Beta angle here instead of the C-Gamma angle.
③	Click to open the angle control interface

Figure 94

Number	Note
①	When angle B is 0 degrees, the fixture should be in a vertical position; this can be verified using a level.
②	Enter 0
③	Click to set the Beta angle to 0 degrees. Note: The 0-degree position for the Gamma angle is not the same as the 0-degree position for the Beta angle.

Figure 95

After rotating Beta to the 0-degree position, mount the floodlight onto the fixture, ensuring that the light-emitting surface of the floodlight faces the photometric probe. Adjust the mounting position of the fixture so that the cross-shaped vertical laser beam aligns with the light-emitting surface of the floodlight.

Figure 96

To ensure the sample is centered in the Goniophotomoeter, rotate the Beta fixture to the position shown in the figure below so that the sample’s light-emitting surface faces the crosshairs. Use the crosshairs to fine-tune the position of the sample holder.

Figure 97

Once the light fixture is installed, you can turn off the crosshair laser.

9.1.2 Turning on the Lights

Please refer to 8.1.2.

9.2 Preheating Parameter Settings

Please refer to Section 8.2.

9.3 Configure Test Parameters and Start the Test

Click “Start Test” to go to the test parameter settings screen.

Number	Note
①	Please select “Floodlight,” and the test mode will automatically switch to B-Beta.
②	The angle range for Plane B is -90 degrees to 90 degrees. There is no need to adjust the angle intervals for Plane B; you can select smaller angle intervals, such as 5 degrees or 10 degrees. The smaller the interval, the higher the test accuracy, but the longer it takes.
③	The Beta plane angle range is -90 degrees to 90 degrees. There is no need to adjust the Beta plane interval angle; unless there are special requirements, select 1 degree. Different interval angles here have no effect on test speed.

Figure 98

For other parameter settings, refer to Section 8.1.3. Once you have configured the settings, click “Start” and wait for the software to complete the test.

10. Processing of Test Reports

10.1 Organizing Database Files

Number	Note
①	By default, all test reports are automatically stored in the currently open database file in the order in which the tests were run.
②	To delete a report, select it and then click “Delete.”
③	To make it easier to find test reports, click the blank button shown in the image below to create a new database file, and store reports for different lighting fixtures in separate database files. After creating a new database file, you can proceed directly with testing without having to recalibrate or reconfigure the system.
④	Click “Open” to view test reports from other database files.

Figure 100

Note 1: The next time the software is launched, it will automatically load the database file used during the previous session. If the path to that database file has changed or its name has been modified, the software will prompt you to create a new database file.

Note 2: Avoid placing database files on your computer’s desktop whenever possible.

10.2 Test Report Display Settings

Number	Note
①	You can double-click to upload a picture of the light fixture.
②	You can double-click the content displayed in this area to edit it.

Figure 101

Number	Note
①	Click “Settings”
②	For unit selection, “cd” is generally used; however, some older standards—such as those regarding energy-saving light bulbs—may require the use of “cd/klm.”
③	Streetlight C0 angle setting. The CIE/GB and IESNA standards have inconsistent requirements; please select the standard you are following.
④	Customize the divergence angle. The software automatically displays the half-peak angle (commonly referred to as the beam angle, calculated as 50% of the maximum luminous intensity) and the effective beam angle (calculated as 10% of the maximum luminous intensity). If you wish to customize the divergence angle, enter the percentage of the maximum light intensity and check the box (e.g., 0.25 for 25%). In this case, the test report will display not only the half-peak angle and effective beam angle but also your custom divergence angle.
⑤	Check this box to display the maximum luminous intensity cone angle in the report.

Figure 102

Number	Note
①	Switch to the “Energy Efficiency Rating” settings screen, then select the applicable standard and luminaire type.
②	Click to apply to the current test report
③	Click OK to save and exit.

Figure 103

Each display window has several settings that allow you to customize the display. Users can experiment with adjusting these settings to achieve their desired display effects.

Figure 103.1

10.3 Processing Test Data

10.3.1 Double-sided luminaires

For lamps that emit light from both sides, use the indoor lamp test mode to test each side individually—that is, set the gamma plane angle range to -90 degrees to 90 degrees during testing—and then generate two test reports.

Number	Note
①	Hold down the “Ctrl” key on your computer keyboard, then click to select the two test reports you just received.
②	Click “Data Synthesis” in the software navigation bar
③	In the pop-up window, you can click to toggle between the upward and downward light beams.
④	Select “Composite”
⑤	Click OK to save and exit

Figure 104

This will generate a new synthetic test report, as shown in the figure below.

Figure 105

10.3.2 Conversion of Test Report Types

Number	Note
①	Click “Type Conversion”
②	Test reports can be converted among four types
③	When converting to a C-Gamma test report, you can use the “termination angle” of the C-plane to generate a symmetric test report. If the termination angle is set to 360 degrees, there is no symmetry; if the termination angle is set to 180 degrees, the report can be converted to an axially symmetric test report; if the termination angle is set to 90 degrees, the report can be converted to a quadrant-symmetric test report; if the termination angle is set to 0 degrees, the report can be converted to a fully symmetric test report. This feature is primarily intended for symmetric indoor lighting fixtures; certain lighting design software programs, such as DIALUX, may require you to use this setting when importing fully symmetric IES files.

Figure 106

10.4 Exporting Test Data and Printing Test Reports

10.4.1 Exporting Test Data

Number	Note
①	Click the red logo in the upper-left corner of the software
②	Click “Export Data” in the drop-down menu

Figure 107

Files can be exported in a variety of standard formats.

Figure 108

10.4.2 Printing Test Reports

Print settings.

Number	Note
①	Click to open the “Print Settings” screen
②	The report displays language options; you can choose between Chinese and English.
③	Page Number Format
④	Report Header Information
⑤	Report Titles in Chinese and English
⑥	General Report Content—Applicable to Reports on All Types of Lighting Fixtures
⑦	Since indoor lights, streetlights, floodlights, and plant grow lights have different key parameters, the report content will vary accordingly. You can select the specific items you want to include in the report.
⑧	TM-30 Options
⑨	CIE color space diagram or SDCM color tolerance diagram—you can choose only one of them.

Figure 109

Number	Note
①	Click to print the currently selected test report
②	Click to print all test reports in the current database file.

Figure 110

11. Daily Maintenance and Care of Equipment

11.1 Routine Maintenance

Start-up procedure: First, turn on the cabinet’s main power switch; then, turn on the power switches for the equipment inside the cabinet and in the darkroom one by one; finally, launch the software. Shutdown procedure: First, close the software; then, turn off the power switches for the equipment inside the cabinet and in the darkroom one by one; finally, turn off the cabinet’s main power switch.

Keep the darkroom control room clean and dust-free to prevent dust from entering the equipment. If there is surface dust on the equipment, wipe it off with a dry, soft cloth.

Avoid exposing the darkroom to high humidity for extended periods; keep a dehumidifier on hand if necessary.

11.2 Routine Maintenance

11.2.1 Cleaning the Photometric Probe

If the darkroom cannot be kept dust-free, clean the light-sensitive surface of the photometer probe regularly (for example, once a month) based on actual conditions to prevent dust from accumulating and affecting test accuracy.

When cleaning, please use a professional lint-free cloth to remove dust without scratching the device.

11.2.2 Standard Lamp

The standard lamp is valid for one year. If you still need to calibrate the darkroom after one year, we recommend purchasing a new standard lamp.

11.2.3 Software

We will update the software from time to time to add features and fix bugs. If you encounter any issues while using the software, please feel free to contact us at any time to obtain the latest version.

11.3 Long-Term Decommissioning and Maintenance

11.3.1 Equipment Cleaning and Protection

Thoroughly clean all equipment surfaces, and cover the main unit, probes, and cabinet with dust-proof cloths; disconnect all power sources.

11.3.2 Environmental Protection

Ensure that the darkroom is dry and well-ventilated to prevent equipment from getting damp. If the ambient humidity is high, keep a dehumidifier on hand.

11.3.3 Monthly Power-On

Conduct a power-on test once a month to ensure that all system hardware is functioning properly.

12. Troubleshooting and Resolving Common Problems

12.1 Communication Errors

Cause of the problem: Check whether the communication cable is securely connected and whether it is plugged into the wrong port; verify that the driver is installed correctly; try a different USB port or communication cable to rule out hardware issues.

Solution: Reinstall the driver, connect the communication cable according to the device identifier, restart the software, and try again.

12.2 Test Errors

12.2.1 Luminous Flux Anomalies

Cause of the malfunction: Check whether the light source is stable and whether the warm-up time is sufficient; verify that the equipment calibration is valid, that the test distance is correct, and that the standard light is functioning properly; check whether there is any external light interference in the darkroom and whether the light path is obstructed.

Solution: Extend the warm-up time, recalibrate the instrument, turn off other light sources in the darkroom, and remove any obstructions from the optical path.

12.2.2 UGR Anomalies

Cause of error: Dimensions of the luminaire’s light-emitting surface were not entered; the luminaire’s beam angle is less than 45°; the calculation standard was selected incorrectly.

Solution: Enter the dimensions of the luminaire’s light-emitting surface (length/width/height) correctly; verify that the luminaire is an indoor luminaire (the beam angle must be sufficient); select the CIE 190:2010 standard and recalculate.

12.3 The Goniophotomoeter does not rotate

Cause of the malfunction: Check whether the host power is on and whether the wiring is correct; check whether the angle controller inside the cabinet is operating normally; confirm whether any foreign objects are jammed in the rotating shaft.

Solution: Check the power supply and wiring, and remove any foreign objects; restart the system and software, then try again.

12.4 Software Malfunctions

12.4.1 Software Crashes

Cause of the problem: Check whether you are logged in to the computer’s operating system with an administrator account; verify that the software is fully installed; check whether the database files are corrupted.

Solution: Log in to the computer using an administrator account; reinstall the software and drivers; create a new database file.

12.4.2 The software displays the message “File is not a database”

Cause of the problem: The database file was deleted or moved; the default program used to open LGF files was changed.

Solution: Create a new database file and save it; restore the default association for LGF files.

12.5 Power Failure

12.5.1 DC Power Output Abnormalities

Causes of Failure: The cabinet’s AC/DC switch was not set to DC; the sample voltage or current exceeded the DC power supply limits; a short circuit in the sample;

Troubleshooting: Please verify that the sample’s voltage and current are within the DC power supply’s output range. For example, the DC3005 model has a maximum output voltage of 30 V and a maximum output current of 5 A. Check whether the sample is short-circuited; if so, repair the sample before retesting.

12.5.2 No AC Output

Cause of the fault: The cabinet’s AC/DC switch was not set to the AC position; the overload protection was triggered;

Troubleshooting Steps: Check the AC power output wiring and sample connections to ensure there are no loose connections or short circuits; if the overload protection is triggered, turn off the power, allow the unit to cool for 5 minutes, and then restart it. Ensure that the sample power remains within the AC power output range; for example, the LSP-500VARC has a maximum output power of 500W.