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The debate over flicker.

The Alliance for Solid-State Illumination Systems and Technologies (ASSIST) released a new publication, ASSIST recommends ... Flicker Parameters for Reducing Stroboscopic Effects from Solid-State Lighting Systems, which addresses the issue of LED light source flicker. The publication provides calculation methods for estimating the detectability and acceptability of stroboscopic effects from flicker using the parameters of frequency and percent of flicker. The calculation methods are based on Lighting Research Center (LRC) work published last year in the Lighting Research & Technology journal.

Flicker and stroboscopic effects have been a concern with solid-state lighting for some time. To provide further data and guidance in this area, ASSIST funded human factors studies of indirect flicker perception. The studies, led by LRC senior research scientist John Bullough, were designed to determine what light source parameters affect the detection of flicker and stroboscopic effect and to assess subjective responses to flicker in terms of acceptance and comfort.

The results from these studies suggest that there is a trade-off between the frequency and the modulation depth in the detection and acceptability of indirect flicker. Follow-up studies systematically evaluated this tradeoff. The conclusions drawn led to the development of the calculation methods detailed in the ASSIST publication. For the complete publication, visit
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Title Annotation:NEWS + NOTES
Publication:LD+A Magazine
Date:Oct 1, 2012
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