The present invention relates to main reflector (115, 215) and cooling system where a light source (109, 209) has been arranged in a main reflector (115, 215) and where cooling air is provided to the light source. The reflector and cooling system comprises a retro reflector (117, 217) arranged outside and facing the main reflector (115, 215) and the retro reflector comprises air inlets (125, 225) for providing cooling air towards the light source and air outlets (127,227) for dissipating heated cooling air from the light source. The system further comprises a separation plate (248) having an aperture (259) between the main reflector and the retro reflector, said separation plate dividing the housing of the system in a first housing compartment (252) where the main reflector is located, and a second housing compartment (256) where the retro reflector is located. The system further comprises a first blower (123, 223) and a second blower (244) to blow cooling air for cooling the light source.