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

The driver is one of the most critical components in LED solutions. The quality of LED luminaires not only depends on the LED light source and optical design, but also on the efficiency and reliability of the driver. A good LED driver must meet seven quality requirements:

• Lifetime.
• Efficiency.
• Power factor.
• Electromagnetic compatibility (EMC).
• Switching current (Inrush current).
• Waveform current.
• Mains voltage filtering.

Drivers are therefore crucial components in all LED solutions. High-quality drivers can be recognised by requesting the technical fact sheets from the manufacturer to check if the above quality requirements are met. ETAP always provides quality LED drivers, perfectly adapted to the solution and thoroughly tested in our labs.

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.