what is c type goniophotometer

Goniophotometer is mainly used to measure the spatial distribution of light intensity and color space of lamps, and output various measurement reports according to the test report:
When a lamp is lit, its light output in the 4π space with the lamp as the center of the sphere is not exactly the same, that is, the light intensity value of each point on a certain spherical surface is different. For each specific lamp, in order to improve the efficiency of light output, it is always designed to have a specific light type beam distribution. The Goniophotometer adopts a rotating mechanism, which is equivalent to moving a photometric probe on a spherical surface of equal radius to measure the light intensity value covering several points on the entire spherical surface, and then use a certain algorithm to draw a light intensity distribution map. That is the light type of the lamp. Compare the measured light type with the designed light type to get an improvement plan, or as a basis for judging whether the test is qualified.

In addition to the light intensity distribution map of the luminaire in the space, the chromaticity distribution map of the luminaire in the space is also required, which is a clear requirement in the LM-79-08 standard. Chromaticity measurement is very different from photometric measurement. Chromaticity measurement needs to measure the entire visible spectrum and then calculate the color, so the photometric probe cannot be used to measure the color, but a spectrometer must be used. Usually the system uses CCD spectrometer to measure color. When you need to measure color, move the fiber optic probe to the front of the photometric probe, and rotate the reflector or lamp according to the set angle step value to measure the color distribution of the lamp at a certain point in space.

The goniophotometer measurement results need to be output in different report formats according to different purposes:
1. ENERGY STAR report format
2. CIE report format
3. IES report format
4. GB report format
5. Report format for special lamps
6. Other customized report formats

LM-79 Moving Detector Goniophotometer (Mirror Type C) 

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