Today, the SSLC Platform is publishing the final report from its international interlaboratory comparison on the measurement of Temporal Light Modulation (TLM). This ground-breaking report summarises the results from an international comparison involving 24 laboratories across 15 countries on how to measure TLM, with several unexpected results.

Please click here to download the IC 2023 Final Report.

Conducted over the last 4 years, IC 2023 worked to evaluate how consistently laboratories around the world measure TLM quantities, covering flicker and stroboscopic effects from LED lighting products. In addition, IC 2023 also served as a proficiency test for laboratories seeking accreditation. Dr. Yoshi Ohno and Steve Coyne led this work and will co-present the results of the analysis at a webinar on 8 July (please click here to register for the webinar).

IC 2023 builds on the earlier SSL Annex Interlaboratory Comparisons (IC 2013 and IC 2017) and is the first to focus on the TLM quantities; short-term flicker indicator (PstLM) and stroboscopic effect visibility measure (SVM), as well as modulation depth, flicker index and perceptual modulation.

Key technical findings from IC 2023 include:

1) Overall proficiency performance of participating laboratories
2) Issues with laboratory uncertainty estimations
3) Large influence on PstLM measurements from AC power supplies
4) Issues with SVM measurements and TLM instruments
5) Large variability and conceptual issues with Mp

Interlaboratory Comparisons are important because they support the lighting metrology community and improve the comparability and accuracy of LED product testing. Over the last decade, the SSLC Platform has conducted three international interlaboratory comparisons to improve measurement accuracy. Today’s report is intended to help governments and manufacturers ensure that new LED products sold to consumers and companies are of high quality and meet the required performance on TLM.

Please register to join us for the webinar on 8 July and learn about the findings from IC 2023. The webinar is being held in cooperation with IEEE Smart Cities and IEEE Smart Lighting and will be delivered twice, once for the Australian/Asian time zones and once for the European/American time zones.