Dayighting Metrics III: Circadian Stimulus (CS) Developed by the Lighting Research Center (LRC), the new Circadian Stimulus (CS) metric quantifies for the first time the effect of light on our circadian system, establishing a relationship between exposure to a certain light source and the suppression of the generation of melatonin in our body. What is melatonin? Melatonin is a hormone…

Daylighting Metrics II: Melanopic Equivalent Daylight (D65) Illuminance The CIE S 026 standard, adopted by the WELL Building Standard v2, defined a new concept in which it compared the effect of a light source on each photoreceptor with that produced by the D65 illuminant, α-EDI (D65). CIE S 026 The standard proposed by the CIE, based on the research of…