Numerical correlation between non-visual metrics and brightness metrics—Implications for the evaluation of indoor white lighting systems in the photopic range

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Summary

This paper analyzes how non-visual metrics derived from ipRGC/melanopsin signals correlate with conventional brightness metrics for white indoor lighting, providing a framework for integrating circadian-effective lighting into standard photopic evaluations. The findings have practical implications for lighting designers seeking to balance visual comfort with non-visual (circadian and alerting) effects without requiring entirely separate measurement systems.

Key Findings

Numerical correlations were established between melanopic/ipRGC-based non-visual metrics and conventional photopic brightness metrics for white indoor lighting in the photopic range.
The study supports that non-visual effect evaluations for white light sources should be primarily based on ipRGC signals reflecting melanopsin activation, rather than traditional luminance or illuminance measures alone.
The correlations identified may allow simplified estimation of circadian-relevant metrics from standard brightness measurements for indoor white light sources.