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UGR Rating

Glare caused by light is a disturbing factor, which can be caused differently by light sources. The UGR was developed for evaluation. The Unified Glare Rating is a procedure intended to harmonize the rating of glare. The lower the UGR value, the lower the psychological glare. With the UGR method, the glare of the entire lighting installation is calculated for a defined observer position.

According to DIN EN 12464-1, different UGR values must be kept depending on the difficulty of different visual tasks:

  • Technical drawing: UGR ≤ 16
  • Reading, writing, classrooms, computer work, control work: UGR ≤ 19
  • Working in industry and crafts, reception: UGR ≤ 22
  • Rough work, stairs: UGR ≤ 25
  • Corridors: UGR ≤ 28