Patent ID: 9603223
Date: 2017-03-21
CPC Classifications: E06B,G01J,H05B,Y02B

Claim:
1. An illumination controller comprising: a light sensor device comprising a first light sensor arrangement configured to sense light within a first spectral range including non-visible light and excluding a sub-range constituted by at least a part of the visible light, and a second light sensor arrangement configured to sense light within a second spectral range including at least a part of said sub-range; a control unit connected with the light sensor device and arranged to determine an amount of daylight based on an output signal of the first light sensor arrangement and a predetermined function, which characterizes the relationship between the spectral power distribution of the infrared spectrum of daylight and the spectral power distribution of the visible spectrum of daylight, and to determine an amount of artificial light based on a comparison of an output signal of the second light sensor arrangement and the output signal of the first light sensor arrangement; and wherein the illumination controller is arranged to control illumination based on said comparison of amounts of daylight and artificial light.