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What is the Introduction of UGR?

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.
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