Light source and light irradiating device

Abstract

A light source and a light irradiating device are provided to efficiently regulate a biological rhythm of a user without changing a color temperature of illumination light, an average color-matching index (Ra) or both. The light irradiating device is comprised of a blue emitter (11) that emits light with major energy in a wavelength region adjacent to a wavelength to minimize a value of M(λ)/z(λ), where M(λ) is a relative sensitivity in an antisecretory characteristic of melatonin and z(λ) is a relative sensitivity of a color matching function, a blue emitter (12) that emits light with major energy in a wavelength different from the wavelength of the blue emitter (11), a red emitter (13), a green emitter (14), a diffusing plate (15) that diffuses light from each emitter, a controller (16); that controls the light emission intensity of each emitter, an information input device (17) that inputs information on adjustment of the degree of biological reaction of each emitter, information on an illumination color temperature and the like, a switch (18) that can turn on or off each emitter, and a memory device (19) that stores the light emission intensity of each emitter and its adjusting methods.

Dependencies are inferred from the claim text.