A light source cooling body, substantially the whole light source cooling body being manufactured of the same thermally conductive material, the light source cooling body comprising: - a hollow space (210, 310, 410, 710) comprising an evaporator (116, 216, 316, 416, 716) and a condenser (112, 212, 312, 412, 712), the hollow space (210, 310, 410, 710) being configured to hold a cooling material partially in a gaseous phase and partially in a liquid phase, a wall of the hollow space (210, 310, 410, 710) being formed by the thermally conductive material, at least a portion of the hollow space (210, 310, 410, 710) is tubular shaped, the hollow space (210, 310, 410, 710) further comprising a wick (211, 311, 411, 711) for transporting the cooling material in the liquid phase towards the evaporator (116, 216, 316, 416, 716) for being evaporated when the evaporator (116, 216, 316, 416, 716) receives heat, the wick (211, 311, 411, 711) being manufactured of the thermally conductive material, - an interface area (102, 202) being arranged to thermally couple with a light source (250, 450, 750) and arranged to receive heat from the light source (250, 450, 750), the interface area (102, 202) being an outer area of the light source cooling body arranged in a direct vicinity of the evaporator (116, 216, 316, 416, 716) and being separated by a thermally conductive wall from the evaporator (116, 216, 316, 416, 716) for allowing heat of the light source (250, 450, 750) to be transported towards the evaporator (116, 216, 316, 416, 716), wherein - the condenser (112, 212, 312, 412, 712) being arranged away from the interface area (102, 202), - except the hollow space (210, 310, 410, 710), the light source cooling body being a homogeneous body (104, 304, 404, 704) of the thermally conductive material, and - the interface area (102, 202) comprises a protrusion (202', 702') protruding from the homogeneous body, the protrusion having a flat surface facing away from the light source cooling body, wherein the flat surface is configured to thermally couple with a surface of the light source (250, 450, 750). - a hollow space (210, 310, 410, 710) comprising an evaporator (116, 216, 316, 416, 716) and a condenser (112, 212, 312, 412, 712), the hollow space (210, 310, 410, 710) being configured to hold a cooling material partially in a gaseous phase and partially in a liquid phase, a wall of the hollow space (210, 310, 410, 710) being formed by the thermally conductive material, at least a portion of the hollow space (210, 310, 410, 710) is tubular shaped, the hollow space (210, 310, 410, 710) further comprising a wick (211, 311, 411, 711) for transporting the cooling material in the liquid phase towards the evaporator (116, 216, 316, 416, 716) for being evaporated when the evaporator (116, 216, 316, 416, 716) receives heat, the wick (211, 311, 411, 711) being manufactured of the thermally conductive material, - an interface area (102, 202) being arranged to thermally couple with a light source (250, 450, 750) and arranged to receive heat from the light source (250, 450, 750), the interface area (102, 202) being an outer area of the light source cooling body arranged in a direct vicinity of the evaporator (116, 216, 316, 416, 716) and being separated by a thermally conductive wall from the evaporator (116, 216, 316, 416, 716) for allowing heat of the light source (250, 450, 750) to be transported towards the evaporator (116, 216, 316, 416, 716), wherein - the condenser (112, 212, 312, 412, 712) being arranged away from the interface area (102, 202), - except the hollow space (210, 310, 410, 710), the light source cooling body being a homogeneous body (104, 304, 404, 704) of the thermally conductive material, and - the interface area (102, 202) comprises a protrusion (202', 702') protruding from the homogeneous body, the protrusion having a flat surface facing away from the light source cooling body, wherein the flat surface is configured to thermally couple with a surface of the light source (250, 450, 750).