UGR  is short for unified glare rating, it measures psychological parameters of subjective discomfort to eyes caused by light fromlighting devices in indoors visual environment, its values can be calculated by thee regulation condition with CIE unified glare value formula.

Ugr environmental requirements of lighting products

ugr is divided into seven levels, namely 28.25.22.19.16.13.10.

28 nearly unbearable glare value

25 discomfort value

22 nearly discomfor value

19 the boundary between comfort and discomfort

16 nearly acceptable glare value

13 nearky glare value

10 no glare value

The illuminance standard of GB50043-2004 mostly is UGR25, UGR22 and UGR19.