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http://dx.doi.org/10.5207/JIEIE.2012.26.10.016

Subjective Evaluation of Brightness Perception and Visual Discomfort by Illuminance Reduction for Different CCT LED Lights  

Youm, Hyun-Ju (Department of Architectural Engineering, Sejong University)
Kim, In-Tea (Department of Architectural Engineering, Sejong University)
Choi, An-Seop (Department of Architectural Engineering, Sejong University)
Publication Information
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers / v.26, no.10, 2012 , pp. 16-26 More about this Journal
Abstract
This study conducted a subjective evaluation of brightness perception and visual discomfort according to dimming speeds and CCTs(Correlated Color Temperatures). Dimming speeds of two different CCT lights(2,700K, 6400K) were set to 1.7%/s, 3.3%/s, 5.0%/s, 6.7%/s, and 10.0%/s respectively. Subjects checked the time when they perceived the change of the brightness and visual discomfort. As a result, when dimming speeds were 1.7%/s, 3.3%/s, 5.0%/s, 6.7%/s, more than half of subjects responded the change of the brightness in 55.0~45.0% dimming ratios, and felt the visual discomfort in 35~25% dimming ratios. When the brightness was changed, dimming level responded to the brightness perception of hight CCT(6,400K) was higher about 8.0% then dimming level responded to the brightness perception of low CCT(2,700K). Dimming level responded to the visual discomfort of low CCT(2,700K) was higher about 5.0% then dimming level responded to the visual discomfort of hight CCT(6,400K).
Keywords
LED Lighting; Dimming Speed; CCT; Brightness Perception; Visual Discomfort;
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Times Cited By KSCI : 3  (Citation Analysis)
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