Unified Glare Rating

This is an approximate model expressing the risk of glare.

The standard values range from UGR 16 (low risk of glare) to UGR 28.
In the standard for workplace lighting EN12464-1, limit values for UGR are imposed for various rooms.

Typical UGR values : 

• Office/Classrooms/Meeting rooms : UGR<19
• Corridors : UGR<28
• Staircases : UGR<25
• Warehouses : UGR<25

3000 K = warm white

4000 K = natural white

5000 K = cool white

The specific luminous flux reflects the relationship between luminous flux and power consumption. Just as with fluorescents, a distinction must be made between the light source’s specific luminous flux (LED component, measured at 25° or 85°C junction
temperature and with a standard control current) and that of a luminaire, including driver and optics.