The debate over flicker.
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 www.lrc.rpi.edu/programs/solidstate/assist/recommends/flicker.asp