Figure 6
From: Correlated color temperature is not a suitable proxy for the biological potency of light
Boxplots of melanopic daylight efficacy ratio (mel-DER) as a function of nominal CCT. (Top left) All SPDs for the “Filtered” dataset. (Top right) The “Filtered” dataset further filtered for Rf ≥ 70. (Bottom left) The “Filtered” dataset further filtered for Rf ≥ 80. (Bottom right) The “Filtered” dataset further filtered for Rf ≥ 90. In all cases, the average mel-DER increases as CCT increases, but so too does the achievable mel-DER range. As the average fidelity floor is raised (i.e., from Rf ≥ 70 to Rf ≥ 80 to Rf ≥ 90), the average, maximum, and achievable range of mel-DER decreases.
