2022 PNNL Series: Taming Flicker Complexity

Taming Flicker Complexity

The IES offers Educational Webinars throughout the year, purposefully spanning a broad range of topics and speaker expertise. This was a live webinar hosted in partnership with the Department of Energy's Pacific Northwest National Lab (PNNL) and is now available as an archived webinar and CEU course.

Description: Temporal light modulation (TLM, also known as flicker) is a problem, especially to the 10-20% of the population that is highly sensitive to it. Although TLM occurs in a low percentage of products, it is visible in automotive lighting, holiday light strings, a range of residential products as well as a few architectural products. In this webinar, presenters will share results from a recent PNNL human-subjects study on the visibility of TLM waveforms at or above 90 Hz, exhibiting different shapes, frequencies, modulation depths, and in the case of rectangular waves, duty cycles. Findings reveal key differences among TLM effects, with implications for lighting metrics.  What does this mean for the lighting industry? A manufacturer will discuss how this and other TLM research affects product development. How can driver and dimmer design be improved to reduce the perception of TLM, and what barriers remain for product development?

Naomi Miller

Senior Lighting Engineer

Pacific Northwest National Lab

Naomi Miller is a designer and scientist working at Pacific Northwest National Laboratory to improve lighting quality using LED light sources and to bridge the gap between technology and application. Her pet peeves include flicker and glare, and she is an active member of CIE and IES committees developing recommendations on outdoor glare, flicker, and light’s effect on human health.

Lia Irvin

Research Scientist

Pacific Northwest National Laboratory

Lia Irvin joined Pacific Northwest National Laboratory (PNNL) in 2018, where she works on advanced lighting research. Her research interests include human factors in lighting, such as flicker and perception of luminance uniformity, which she investigates in both laboratory and field studies.

Mark Saes

Vice President


Marc Saes is VP of innovation and one of the founders of the eldoLED startup, acquired by Acuity Brands in 2013. He is an EE & CS alumnus of the Eindhoven University of Technology in the Netherlands. Within the lighting industry he has worked on defining what a universal smart led driver actually is and does, continuously improving both driving and controlling the LEDs in such a way that deep dimming, smooth fading, and flicker-free performance are possible in a practical and power-efficient LED driver.


Taming Flicker Complexity
Open to view video.
Open to view video. This video is required for course completion.
1.00 CEU credit  |  Certificate available
1.00 CEU credit  |  Certificate available