The irradiance output in the range of 380 — 780 nm at 4 - nm intervals was converted to 1 - nm intervals for calculation of the human
retinal photopigment illuminance measures (cyanopic, melanopic, rhodopic, chloropic, and erythropic lux)(35).
The researchers found that mammalian melanopsins possess a less stable bond with the chromophore
retinal, a vitamin A derivative, than the closely related
photopigments.