How to do UGR measurement using a goniophotometer?

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A goniophotometer is a device that measures the angular distribution of light emitted or reflected by a sample, it is also called UGR measurement machine. This may be accomplished in a variety of different ways. The following are the actions that need to be done to do photometric testing known as a UGR (Unified Glare Rating) with a goniophotometer:

  1. Place the goniophotometer in such a way that the light source being evaluated is situated in the exact middle of the measurement chamber.
  2. Adjust the angle of the detector to get the desired reading, which is normally between 0 degrees and 90 degrees with respect to the vertical axis.
  3. Place the light source or luminaire that is going to be evaluated within the measuring chamber of the goniophotometer.
  4. Perform an experiment in which you measure the amount of light coming in via each detector and write down the results.
  5. It is necessary to repeat steps 2 and 4 in order to collect data from a variety of angles that encompass the whole field of view of the detector.
  6. Calculating the UGR value requires making use of the observed intensities in conjunction with the proper equation or piece of software.
  7. To get a comprehensive characterization of the system or light source that is being evaluated, it will be necessary to carry out the measurement a number of times using a variety of light sources and/or under a variety of different situations.

It is important to be aware that the measurement of the UGR is a common approach that is used to analyze the glare that is produced by a lighting system. Typically, it is carried out in accordance with the standards established by IESNA RP-33 or CIE 117. 

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