UGR Measurement GR TI Photometric Testing Equipment for Glare Light Test

GTS-LS

The GTS-LS glare measurement system uses an image luminance meter with great precision. Testing UGR, TI, and GR used in indoor and outdoor light pollution tests is a good idea. Through a precise electronically controlled pan and tilt and specialized measurement and control software, the high-precision measurement and analysis of the unified glare index UGR is made possible. The system is compact and lightweight, with outstanding measurement stability and quick speed. The device has a built-in battery, does not require an external power source, and can be tested by connecting a USB cable to a computer.

1. Glare testing using an image luminance meter

The brightness of each point in the lighting scene is precisely measured using a high-precision image luminance meter, and the glare index is then calculated using the theoretical method.

2. Wide dynamic range, high sensitivity measurement, and multiple exposure technology

The repeated exposure technology is used to create high dynamic pictures (HDR), which can precisely measure both indoor and outdoor situations, with brightness measurements as low as 0.001cd/m2.

3. Measurement with little distortion and a wide field of view

This technology addresses the issue of high distortion when the fisheye lens scans a large field of view and can achieve up to 2 full-space low-distortion luminance image measurement by using a precise pan-tilt to drive the multi-angle test of the imaging luminance meter.

4. High resolution, high angle accuracy

High resolution and high angular precision are maintained regardless of whether the obtained brightness image is towards the center of the field of view of the observation angle or in the periphery, and the issue of low resolution surrounding the fisheye lens is better avoided.

5. Software function that simultaneously satisfies the requirements of both indoor and outdoor glare tests

It is capable of measuring glare indicators such as TI, UGR, and GR both indoors and outside.

How is UGR calculated?

Popular lighting design software like Relux, Dialux, and AGi32 calculate UGR. The photometric files of the fixtures to be used in the lighting scheme, the room geometry, the surface reflectance, and the number and spacing of the fixtures are among the data that must be included. The UGR will be determined by the lighting design program using these data.

How can I lower an installation’s UGR?

There are numerous actions you may take during installation design to reduce UGR

•  Consider where people are sitting in the room in relation to where the light fixtures are located. For instance, if the design of a classroom is known, place the lights such that they are not in the pupils’ line of vision as they turn to face the teacher.
•  Consider your lighting options.
•  Can they be suspended at a lower height if they are?
•  Could you incorporate an up lighting component? By shining light onto the ceiling, the contrast between the fittings and the background is reduced, lowering the UGR. Choose ceiling-mounted fixtures with a smaller beam angle. This reduces the viewer’s perception of luminous intensity. Take cautious – this may reduce uniformity; try decreasing the wattage and installing extra fittings to compensate.
•  Consider employing fixtures with a diffuser or other light-emitting surface that is recessed behind a bezel.

In conclusion, to lower the UGR, you must Increase background brightness

•  Angle the luminaires away from the viewer so that they are not beaming in their eyes.
•  Avoid placing the fittings in the viewer’s direct line of sight.
•  Reduce the luminance of the luminaire as seen by the viewer (narrow the beam angle or reduce the wattage).
•  Prevent placing the fixtures in the line of sight of the viewer

A UGR-19 light fixture: what is it?

There is not anything like that. UGR refers to a system, not a light fixture. What does it imply, though, when several manufacturers market light fixtures as “UGR-19”?

If the fixture is utilized at typical heights and spacings in the location for which it is intended, it will help the lighting designer produce a UGR of 19 because of the product’s light distribution. Since there is no assurance that employing a “UGR19” light fitting in a workplace or school (for example) will provide a UGR of 19, choosing fittings with the proper lighting distribution will increase your chances. The “UGR19”-declared fixtures will have a dominant downward component, limited lateral output (resulting in a rather narrow beam angle), and some may even have an up light component.

Clinical Use of Glare Testing: Sports Vision, Cataracts, and PCO

Testing for glare is a great way to measure vision loss brought on by light scatter. A corneal scar or a lens opacity brought on by cataracts can cause incoming light to scatter in the eye, scattering light rays across the retina.

Image contrast is decreased by this light scatter. Patients with considerable light scatter-related vision impairments frequently nevertheless have good visual acuity since routine acuity tests employ high contrast black-on-white letters to measure visual acuity.
Patients may still read the letters even when the light scatter makes them appear faded out. The loss in eyesight brought on by light scatter can be precisely measured using the Glare test devices when glare and contrast sensitivity are coupled.

Measure Glare-Related Vision Loss for Cataracts

It is advisable to test the patient’s contrast sensitivity first without the glare source turned on, and then again with the glare source turned on, to determine the extent of visual loss brought on by glare (i.e., owing to light scatter).
When glare and non-glare circumstances are compared, the difference in vision loss shows the real-world vision loss brought on by cataracts and other opacities in the optical path. For cataract patients, a functional acuity score can be calculated using the vision loss.

How to Document Using Contrast Sensitivity and Glare Testing for Cataract Vision Loss Glare

Glare testing can be used to confirm the vision loss brought on by posterior capsule opacification (PCO) following cataract surgery prior to YAG Capsulotomy. If the PCO is creating enough light scatter for the patient to experience severe effects, it can be swiftly evaluated on patients both with and without glare.

The PCO-related vision loss can be described using the functional acuity score, which can also be used to prove that the YAG operation is necessary. The glare test method can also be used for sports vision testing to help athletes determine the optimum sorts of sunglasses or goggles to wear to maximize visual performance, for example, for a professional skier.

The degree of glare required to evaluate sunglasses or goggles is higher than that required to evaluate cataracts. this means that the the practitioner will need to adjust while conducting the test. For instance, you might ask the athlete to wear different pairs of sunglasses while you conduct the glare test with the glare setting at its greatest level to assess the visual performance offered by sunglasses under particular glare situations. Keep track of the type of eyewear that improves contrast sensitivity in glare.

Standardization

Some glare testing systems are fully self-calibrating standardized glare testing instruments. The proprietary circuitry automatically calibrates the testing light brightness and glare source, ensuring constant test results that can be documented. This contrasts with other forms of glare experiments, which employ uncalibrated light sources. The glare source is factory adjusted for the optimal light level for cataract documentation.

Testing Procedure

Specific models are intended for testing from an 8-foot viewing distance. This enables the instrument to be mounted on a wall or a moving floor stand in the examination room. Other glare test systems employ a computer-based testing system that allows for testing distance adjustments ranging from 6 to 16 feet. The device can be placed on a table, hung on the wall, or rolled around on a floor stand. The software also enables the gadget to be configured for mirrored viewing.

The majority of these glare test devices are designed to assess contrast sensitivity at a distance, allowing the patient to be tested through the phoropter. When compared to hand-held glare equipment or look-in devices, seeing through a phoropter makes evaluating glare sensitivity for patients employing optimal correction considerably easier.

FAQs

What is the glare?

Glare is defined as a loss of visual performance or discomfort caused by light intensity in the visual field that is greater than the intensity of light to which the eyes are acclimated. Simply explained, glare happens when an excessive amount of light enters your eye and interferes with its capacity to manage it.

How is the glare test carried out?

The patient studies the equipment, or some Snellen letters put on a wall chart during glare testing. The examiner then shines lights straight into the patient’s eyes. The lights have been set to resemble the brightness of headlights approaching the patient at night, including high and low beams.

What exactly is UGR?

The relative intensity of light from a light fitting compared to the intensity of light from the surrounding region, as perceived by the viewer, is expressed as UGR. Only for an indoor lighting arrangement can a UGR be determined. It cannot be estimated for an outside system (such as street lighting), nor for a single light fitting.

What exactly is glare testing?

Glare testing can be performed to confirm vision loss caused by posterior capsule clouding (posterior capsule opacification, or PCO) after cataract surgery. Patients can be immediately checked with and without glare to see if the PCO is creating enough light scatter to be debilitating.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

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