Figure 7
From: Correlated color temperature is not a suitable proxy for the biological potency of light
The range of Circadian Stimulus (CS) values as a function of Circadian light (CLA) for 100 lx (top), 300 lx (middle), and 1000 lx (bottom). At any fixed photopic illuminance, a substantial range of CS values can be achieved due to the choice of spectrum alone. The largest range occurs near 300 lx which falls near the inflect point of the CS sigmoid curve. Values are not sub-divided by CCT.
