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Unified Glare Rating (UGR) and subjective appraisal of discomfort glare

tLighting Research Laboratory, Matsushita Electric Industrial Co. Ltd., 3-4, Hikari-dai, Seika, Soraku, Kyoto 619-02, Japan

Rikuo Muramatsu, MA

Department of the Built Environment, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226, Japan

Sueko Kanaya, DrEng

Light Development Center, Matsushita Electronics Corporation, 1-1 Saiwaicho, Takasuki, Osaka 569, Japan

The study investigated the correlation between the subjective glare rating and the Unified Glare Rating (UGR). Experiments and analyses were carried out. The results showed that there was a good correlation between the subjective glare rating and the UGR glare indices, but that the subjective glare ratings were always a few units lower than the UGR glare indices. The reason for the difference between them may be that simply 'adding up' the glare sensation is not an appropriate way to evaluate discomfort glare. Finally, a method is proposed for modification concerning the additivity of discomfort glare.

Lighting Research and Technology, Vol. 28, No. 4, 199-206 (1996)
DOI: 10.1177/14771535960280040501


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