Glare meter, Glare tester

What is the UGR (Unified Glare Rating)?

UGR stands for ‘Unified Glare Rating’ and is a method for assessing the glare effect of indoor lighting systems. It evaluates ‘psychological’, i.e. disturbing glare, but where there is no reduction in visual performance. The calculation method only provides meaningful results for mainly direct distribution luminaires. It only takes into account direct glare from luminaires, but not reflected glare caused by reflections on surfaces.

1. How can the UGR value be calculated?

The UGR value is calculated according to a method presented by the CIE in 1995 (source: Technical Report 117). As a system-related assessment, the UGR method takes into account all luminaires in the lighting installation that contribute to the glare. The calculation rule totals the glare effect of all light sources based on their average luminance, spread and position in relation to the viewing direction. It also considers the dependence of the eye's sensitivity to glare on the background luminance. Logarithmic scaling (lg) and a pre-factor of 8 give a value range from 10 (lowest probability of glare) to 30 (very high probability of glare). A computer simulation makes it possible to calculate the UGR value at any location in the room for any direction of view.

The GMS-1000 glare measurement system adopts a high-precision imaging luminance meter. It is good to test UGR ,TI,GR ,DGI, used in Indoor and outdoor light pollution test.The high-precision measurement and analysis of the unified glare index UGR is realized through a precision electronically controlled pan/tilt and special measurement and control software. The measurement stability is good, the speed is fast, and the system is small in size and light in weight. . The system comes with a battery, no external power supply is required, and can be tested by connecting a USB cable to a computer.

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