Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/25719
Title: Evaluating discomfort glare from non-uniform electric light sources
Authors: Cai, H
Chung, T
Issue Date: 2013
Publisher: SAGE Publications
Source: Lighting research and technology, 2013, v. 45, no. 3, p. 267-294 How to cite?
Journal: Lighting research and technology 
Abstract: This study tested the appropriateness of unified glare rating (UGR), CIE glare index (CGI), British glare index (BGI), and visual comfort probability (VCP) for evaluating discomfort glare from common non-uniform electric light sources. An experiment was conducted in a windowless room. High dynamic range photogrammetry was used for measuring three non-uniform fluorescent glare sources. The luminance and geometry data were acquired to calculate the glare ratings. The sub-divisibility and additivity of UGR, CGI, BGI, and VCP were tested via numerical method. Their predictability was evaluated using 67 subjects in two sessions. It was found that UGR, CGI, BGI, and VCP all have valid additivity, but only UGR and CGI have valid sub-divisibility. Current formulae of UGR, CGI, BGI and VCP all overestimate the glare sensation from non-uniform sources that young people may feel.
URI: http://hdl.handle.net/10397/25719
ISSN: 1477-1535
EISSN: 1477-0938
DOI: 10.1177/1477153512453274
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