Control system for controlling the light output of a led luminaire

Abstract

This invention relates to a control system for controlling the light output of a LED luminaire comprising a single color LED group consisting of at least one LED. The control system comprises a spectral filter and a photodetector, which thus receives spectrally filtered light from the LED group. The photodetector generates a response signal which is applied to a control device. The control device controls the light output of said LED group at least partially on the basis of the response signal. The control system further includes an incidence angle limiting device arranged to limit the angle of incidence of the LED light received by said filter.

Dependencies are inferred from the claim text.