Patent ID: 7391162

Claim:
A luminaire with at least one LED as luminous means, comprising: a) a sensor ( 49 ) for detecting at least a part of the light emitted by the at least one LED ( 22 ), b) a control unit for evaluating the detected signals from the sensor and for influencing the at least one LED ( 22 ) in a manner dependent on the sensor detected signals, wherein the control unit regulates an electric current of the at least one LED (LED current) in a manner dependent on the sensor detected signals such that a light intensity of the at least one LED ( 22 ) remains greater than a reference value wherein the reference value of a desired light intensity of the at least one LED is defined by the control unit as follows: a) after the luminaire has been switched on for a first time, the desired value of the light intensity is determined as the reference value in a manner dependent on the sensor detected signals then present, b) the reference value is stored by the control unit.