LSG-1800: Automatic Goniophotometric Measurement System
This horizontal goniophotometer is another goniophotometric system that we often use. The test distance of the detector of the test system is between 1.41m and 11.41m. The lamp is installed on the turntable that can rotate around the horizontal and vertical direction. The vertical axis line of the turntable is fixable, the horizontal axis is [...]
Large Goniophotometric System: Goniophotometer With Rotating Mirror
At present, goniophotometers we often use basically have two sets, goniophotometer with rotating mirror is one of them. The detector of this kind of system is fixed on the position of 19.83 m; the constant temperature device added on the detector makes the temperature keep 35℃. This testing system has three rotation axes. The spindle [...]
Some Knots Need to Pay Attention to In Order to Get the Accurate Photometric Data
The following knots need to pay attention to in order to get the accurate photometric data: a) Luminosity measured distance The luminous intensity measurement is to measure the illumination of a certain distance; the light intensity value can be got through calculating the inverse distance square principle in photometry, namely I, E, R2. In this [...]
The Distribution Photometric Measurement Is The Key Link Of The Quality Control In Lamps and illumination design
For the lighting industry, lamps and lanterns play a very important role. A good lighting design is realized by choosing the appropriate lamps. Choosing the appropriate lamps and lanterns and building a reasonable and comfortable lighting environment, can not only meet the needs of People’s Daily life, but also provide a safe, energy-saving and high-efficiency [...]
Software Update for LSG-1800 Goniophotometer
Lisun Group updates LSG-1800 software to version 1.30 before Christmas Day. It is free to download for the customers who ever ordered LSG-1800 from Lisun before2011-12-24. Comparing to the LSG-1800 version 1.20, the version 1.30 has the following advantages: The LSG-1800 Ver1.30 can be added company logo in the test report: please make your company [...]
A Near-field Goniospectroradiometer for LED Measurements
ABSTRACT Designing micro-optics for light-emitting diodes must take into account the near-field radiance and relative spectral power distributions of the emitting LED die surfaces. We present the design and application of a near-field goniospectroradiometer for this purpose. Keywords: Near-field photometry, goniophotometer, LED measurement, spectroradiometer 1. INTRODUCTION One of the often-touted advantages of high-flux light-emitting diodes (LEDs) [...]
Basic Theories About Goniophotometer Part4: How to Determine the Right Measuring Distance When Measuring the Luminous Intensity Distribution
The equation [I(γ)=d*d*E(γ)] only applies when the distance d is large enough to view the lamps or luminaries as a point source approximately. EN 130-1:2004 specifies the requirements of measurement distance: The measurement distance shall be at least 5 times the largest luminous dimension of the test source. However for luminaries with distributions significantly different [...]
Basic Theories About Goniophotometer Part3: Spatial Luminance Distribution and Spatial Spectral Distribution
Spatial Luminance Distribution and Near-field Goniophotometer The spatial luminance distribution and the size of emitting area different directions are important quantities, especially for the glare performance estimation. The imaging luminance meter based on CCDs receives the light from the source directly, and measure the luminance (luminance meter) of every point in the emitting area as [...]
Basic Theories About Goniophotometer Part2: High Accuracy Measurement for Luminous Flux
2. High accuracy measurement method for luminous flux of luminaries and lamps The derivation of luminous flux from a measurement of illuminance distribution of a light source is the method which can usually achieve very high accuracy. The measurement principle can be expressed as: φ=∫E*dS (s) This is also the method for many developed countries [...]
Lisun Group Products List Part1: Goniophotometer
Goniophotometer of Lisun Group: LSG-1800: With facility of double arms for turning the light source. When doing light measurement, the long measuring distance can easily be achieved. LSG-2000: Mirror on optical axis. When measuring light source, the holder for light source has to move in a large space during the measurement. LSG-1900: Lamp on optical axis. It overcomes [...]
Basic Theories About Goniophotometer Part1: Luminous Intensity Measurement
Main functions and basic principle of goniophotometer 1. Goniophotometer for luminous intensity measurement. A goniophotometer is a photometer for the measurement of the angular dependence of a photometric quantity, that is why “goniophotometer” has been named. It is applied widely t measure te luminous intensity distribution, luminous flux and efficiency of lamps and luminaries. Take [...]
LSG-2000: Goniophotometer with Rotating Mirror
Function of LSG-2000 for measuring light: It is the most popular goniophotometer with rotating mirror used by global international laboratory (including the nine global laboratories such as Philips). International Commission on Illumination CIE NO.70 recommended that the standard structure should be used to measure the space light intensity distribution and many other photometric parameters of [...]
LSG-1800: Rotation Luminaire Goniophotometer
Function of this light measurement: According to the requirements of the National Standards, CIE, IESNA, through the rotating lamps and lanterns, to realize many measurement methods such as B-β, A-a and C-γ, etc. These methods are used for measuring light intensity distribution and many other photometric parameters of indoor lighting lamps and lanterns, throwing light [...]
