Lighting metrics related to vision are based on what we knew 100 years ago. It's time to recalibrate
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References
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The two methods were 1) equality-of-brightness with simultaneous comparison and 2) flicker method with alternate comparison.Equality-of-brightness was considered more capable of greater precision, but failed when comparing light sources of significantly different hues and the step-by-step method used in their paper resolved this problem.
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Illuminating Engineering Society.ANSI/IES LS-8-20, Lighting Science: Vision - Perceptions and Performance. New York: IES; 2020.
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A starting point could be the ‘What is Bright’ portable system developed as a follow up to the Schlessleman et al experiment (ref. 7) that has been to the IES Annual Conference, the IES Research Symposium, NIST and PNNL.
