between the leds 7 7 u2032 or the optional dispensed layer 8 and the outlet plane defined by the edge of the mixing chamber walls respectively the inner side of the walls in the example 40 delimiting the light mixing chamber is preferably embodied as reflective and or scattering therefore premixing of the light from the leds 7 7 u2032 and optionally of the color conversion material in the dispensed layer 8 will occur in the light mixing chamber before this mixed light reaches the actual reflector interior volume delimited by the inner lateral surface 70 of the reflector 2 as schematically shown in fig1 the light mixing chamber can be delimited in the light emission direction of the leds 7 7 u2032 by a light transmissive cover 90 which can contain conversion material and or novel particles this cover 90 is thus an example that color conversion material can be arranged in the light emission direction but at a distance to the leds 7 7 u2032 a mixing chamber which is not filled up i e only contains air can be located between this color conversion material and the leds 7 7 u2032 the dispensed layer 8 is only an example of how.