Figure 14
From: Correlated color temperature is not a suitable proxy for the biological potency of light

Two spectral power distributions with nearly identical spectral curves (left) but with a CS differing by 100% at a photopic illuminance of 300 lx (right). Because the SPDs are nearly overlapping, the dashed SPD may be difficult to see. For orientation, the largest spectral differences occur near 450 and 480 nm.