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Abstract

A white light source and method of use thereof, wherein control of daily rhythm and pleasant lighting can be realized. Amounts of stimulation light emitted from a white light source to the intrinsically photosensitive retinal ganglion cells (ipRGCs) and visual cells of the L cone and M cone, are defined as a melanopic irradiance, an L-cone opic irradiance, and an M-cone opic irradiance, respectively; a ratio of the amounts of the stimulation light is expressed by formula (1); and A is the ratio corresponding to the emission spectrum of the white light source, and B is the ratio corresponding to the radiation spectrum of a black body having the same color temperature as the white light source, an amount of stimulation light emitted to the ipRGC is quantitatively changed by changing the emission intensity of the white light source satisfying formula (2).

description='In-line Formulae' end='lead'Melanopic irradiance/(L-cone opic irradiance+M-cone opic irradiance)  (1)description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'0.88≤A/B≤1.11  (2).description='In-line Formulae' end='tail'

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First Claim