Accurate measurement of the short term flicker indicator is important for avoiding visible flicker and for SSL products compliance with regulations. The IC2023 Interlaboratory Comparison of temporal light modulation measurements revealed large variations depending on the laboratory-grade AC power supplies used.

A technical study using a halogen lamp was carried out, resulting in 45 measurements covering 19 different manufacturers of AC power supplies. It demonstrates the large differences of measured values of more than one order of magnitude and a correlation with low frequency components is found. A new method to estimate the low frequency noise of a specific power supply and its influence on the measured short term flicker indicator is proposed. Setting a limit for this of 0.03 would make 50 % of the power supplies fail. Laboratories will be able to use this method to evaluate the suitability of their specific AC power supply, and its influence on short term flicker indicator measurements, and use it in measurement uncertainty estimation.

Carsten Dam-Hansen, Department of Electrical and Photonics Engineering Technical University of Denmark Roskilde, Denmark; Gillian Isoardi, Light Naturally Brisbane, Australia; Jiaye Li, National Institute of Standards and Technology Gaithersburg, USA; Yoshi Ohno, National Institute of Standards and Technology Gaithersburg, USA; Steve Coyne, Light Naturally Brisbane, Australia; and Michael Scholand, 5SSLC Platform London, UK
Paper presented at Lighting Sciences 24 on 13 November 2024, Eindhoven, The Netherlands.