What is UGR?

Glare is an extremely important consideration in many lighting applications - particularly from a health and safety standpoint in the workplace, for sports lighting and to also to ensure that an artificially lit environment is visually comfortable. Glare is essentially how bright the light source appears compared to the surrounding area whilst looking in its direction - the UGR is a numerical way to represent the glare characteristics from a variety of angles. A high UGR is the reason why some light sources appear to be extremely bright to look at but do not actually provide much light at ground level.

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