mounted on a circuit board 2 but also a cooling element 30 consisting of cooling ribs cooling pins or the like so that the coolant guided in a first coolant line 81 and entering the housing 40 via the coolant inlet 41 and leaving the housing 40 via the coolant outlet 42 flows around both the led light source 1 and the cooling element 30 and emits the absorbed heat to the environment or to a heat absorbing device via a cooling system 7 analogous to the representations of fig4 to 6 the optical window 5 arranged in front of the leds 1 in emission direction of the leds can be formed as plane parallel plate or as lens lens array or light mixing rod in order to perform a beam formation and or color mixing in this embodiment too a dynamic beam formation can be achieved by an optical window 5 arranged in front of the led light source 1 in a fluid tight but movable way it can be coated with luminescent material and thus fulfill the function of a remote phosphor light source the leds 1 mounted on the circuit board 2 are connected with a power supply cable 14 which is connected to an electronic controller a mains unit or ballast 12 the control unit mains unit or ballast 12 is connected with a voltage source via a mains cable 13 with reference to the schematic representations of fig1 to 16 various cooling systems 7 a to 7 e will be explained wherein the type of cooling and recooling however is not limited.