Patent ID: 8649004

Claim:
A light sensor for a lighting device, the light sensor comprising a light diffuser, an optical non-transparent housing having a window forming a light entry aperture, the optical non-transparent housing preventing light entry into the housing except through the window; at least one interference filter; at least two photo sensors providing a first angle of incidence of light entering the housing with respect to the window and a second angle of incidence of light entering the housing with respect to the window, the light diffuser being arranged in such a way that light from outside the optical non-transparent housing passes through the light diffuser so as to enter the interior of the optical non-transparent housing via the window, the combination of the light diffuser and the window constituting a substantially Lambertian radiator with a Lambertian ray pattern according to Lambert's cosine law with respect to the surface of the interference filter if light enters the interior of the optical non-transparent housing via the window, the interference filter and the at least two photo sensors being arranged in the interior of the optical non-transparent housing to position the at least two photo sensors at said first angle of incidence and the second angle of incidence, the first angle of incidence different than the second angle of incidence, said interference filter being arranged between the window and the at least two photo sensors such that the relative intensity of light passing through the window is detectable in at least two different wavelength ranges.