Negative sensation caused by excessive and uncontrolled brightness in the visual field
The degree of glare not only depends on the luminaire but also the positon of the observer, the room dimensions and reflections of the surfaces.
Unified glare rating (UGR) - measure of the glare in a given environment
- UGR data should be provided by the manufacturer of the luminaire often found in the specifications or datasheets of the luminaire (e.g. in an office, the luminaires should have an UGR ≤ 19)