Patent ID: 8358075

Claim:
A device for light emission ( 1 ) comprising a) at least three light sources ( 2 1 , 2 2 , 2 3 ), b) energy supply elements ( 3 1 , 3 2 , 3 3 ) configured to supply energy to the light sources ( 2 1 , 2 2 , 2 3 ), c) a sensor ( 5 ) configured to detect the light emission from the light sources ( 2 1 , 2 2 , 2 3 ) as a whole, and d) a control unit ( 4 ) configured to control the energy supply elements ( 3 1 , 3 2 , 3 3 ) for supplying energy to the light sources ( 2 1 , 2 2 , 2 3 ), wherein the control unit ( 4 ) is configured to control the energy supply elements ( 3 1 , 3 2 , 3 3 ) for supplying energy within a calibration phase in such a manner that the light emission from the light sources ( 2 1 , 2 2 , 2 3 ) is detected by the sensor ( 5 ) in a sequence of measuring periods, and to calculate the brightness of each individual light source ( 2 1 , 2 2 , 2 3 ) on the basis of the information received from the sensor ( 5 ), wherein the light detected by the sensor ( 5 ) in at least one of the measuring periods originates from several of the light sources ( 2 1 , 2 2 , 2 3 ).