Led system for producing light

A method for controlling light being emitted from a light-emitting system comprising a plurality of light emitting diodes, LEDs, said method comprising controlling at least all of the following parameters:

• the temperature of the surroundings of each of the LEDs, the luminous flux of each of the LEDs, and an electrical power being supplied to each of the LEDs, and where controlling the surrounding temperature controls the luminous intensity being emitted from the system, thus controlling the luminous flux of the LEDs, and does not decrease the lifetime of the LEDs by the current of the electrical power not being increased during the lifetime of the LEDs.

A system comprising a plurality of LEDs for producing light, wherein each or sections of the LEDs are emitting light at different wavelengths and said system further controlling the luminous flux of each or sections of the LEDs separately, and said system further controlling the luminous flux of the overall system comprising a plurality of LEDs by means of both controlling the surrounding temperature, either of each of the LEDs or commonly of all of the LEDs, and by means of controlling an electrical power being supplied to each of the LEDs, and where controlling the electrical power consists in not increasing the current during the lifetime of the LEDs for thereby not decreasing the lifetime of the LEDs.