Today, the National Electrical Manufacturers Association (NEMA) published NEMA 77-2017 Temporal Light Artifacts: Test Methods and Guidance for Acceptance Criteria. Temporal Light Artifacts (TLA) are undesired changes in visual perception induced by a light stimulus whose luminance or spectral distribution fluctuates with time, such as flicker and stroboscopic effect.
This new lighting standard makes recommendations on methods of quantifying the visibility of TLA, and initial, broad application-dependent limits on TLA.
“Besides adjusting visible light output, many dimmer designs can react with LED light engines to produce additional light modulation in the form of TLA,” said Jim Gaines, PhD, of Philips Lighting and chair of the NEMA 77 working group. “NEMA 77 provides a method to quantify the likelihood that a given light modulation might produce observable TLA, and employs a measurement framework that allows for further refinement to develop application-specific guidelines.”
NEMA 77-2017 is available for $265 in hard copy and as an electronic download on the NEMA website.