Circadian rhythm management apparatus and system

A circadian rhythm management apparatus comprising:

• an illuminance measuring portion which measures a bio illuminance value of external light using a circadian lambda filter which passes the external light along according to a circadian rhythm sensitivity curve and a visual lambda filter which passes the external light along according to a visual sensitivity curve;
• a controller which outputs a control signal which reinforces a user's circadian rhythm on the basis of the bio illuminance value,
• wherein the illuminance measuring portion comprises a photo sensor that senses and converts the external light, which has passed through the circadian lambda filter, into a circadian wavelength signal and senses and converts the external light, which has passed through the visual lambda filter, into a visual wavelength signal;
• an illuminance calculator which calculates a ratio between the circadian wavelength signal and the visual wavelength signal, calculates a circadian action factor by applying a ratio between the circadian wavelength signal and the visual wavelength signal to a circadian action function which varies according to the visual wavelength signal, and calculates the bio illuminance value on the basis of the circadian action factor;
• and a function storage which stores a plurality of circadian action functions which vary according to each of certain sections of the visual wavelength signal.