m-DER is the abbreviation of Melanopic Daylight Efficacy Ratio, which is defined by the CIE and introduced in theCIE S 026/E:2018document. Also called the Melanopic DER, this metric is invented for evaluating the circadian effect compared to natural light.The m-DER is a mathematical calculation and the formula of is complicated, however, we can simplify it for easier understanding.

Circadian rhythm lighting is no longer a novel concept that everyone may has different understandings of it and it could be from simple color temperature tuning to comprehensive spectral power distribution, or from simple brightness diming to follow the ipRGCs (intrinsically photosensitive retinal ganglion cells) rhythm feature to design the dimming program…here we will introduce five key metrics that the circadian rhythm lighting will never get around of these and they stand for the non-visual biological effect from light, and understanding these metrics are particularly important for designing the new era of human-centric lighting.

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