Patent ID: 7288900

Claim:
An illumination system having at least two light sources of which at least one light source comprises an LED ( 11 ), characterized in that it furthermore comprises: a driver device ( 22 ) that is designed to operate at least the one LED ( 11 ) with a DC signal; a sensor device ( 12 ) with the aid of which at least one feature of the light output by the illumination system can be determined; an actual value storage device ( 14 ) that is connected to the sensor device ( 12 ) and in which an actual value of the at least one feature can be stored; a setpoint selection device ( 18 ) in which a setpoint of the at least one feature can be stored; and a control device ( 16 ) that is connected on the input side to the actual value storage device for the purpose of transmitting the actual value of the at least one feature, and to the setpoint selection device ( 18 ) for the purpose of transmitting the setpoint of the at least one feature, and which is designed to provide the driver device ( 22 ) at its output with a control signal in such a way that the driver device changes a characteristic of the DC signal used for driving the at least one LED ( 11 ) in such a way that the actual value approaches the setpoint.