The Lighting Research Center in Troy, N.Y., has published a report in the journal Lighting Research & Technology on the subject of flicker and stroboscopic effects as they relate to solid-state lighting (SSL). The human factor studies were funded by the Alliance for Solid-State Illumination Systems and Technologies (ASSIST) and will serve as the basis for future ASSIST recommended guidelines on flicker in SSL systems. The new report identifies thresholds and acceptance levels for indirect perception of flicker. Project and report summary can be found at