Figure 13
From: Correlated color temperature is not a suitable proxy for the biological potency of light
Circadian Stimulus (CS) as a function of melanopic equivalent daylight illuminance (mel-EDI) at a photopic illuminance of 500 lx enlarged from Fig. 12 with the addition of subdivisions for nominal CCT. Arrows show, on average, increasing Rf. Zooming in on the relationship at a fixed illuminance illustrates the large range of achievable CS values at a fixed mel-EDI that is driven by spectral configuration and partly driven by the discontinuity between “blue wins” (rBY+) and “yellow wins” (rBY-) of the CS model. The horizontal grey dashed line indicates the daytime CS recommendation of CS ≥ 0.3 of UL 24480.
