An illumination device (100, 200) comprising: - a first light source (111 a) and first light collecting means (113a, 209a), said first light collecting means configured to collect light generated by said first light source and convert said light into a first source light beam propagating along a primary optical axis; - a second light source (111 b) and second light collecting means (113b, 209d), said second light collecting means configured to collect light generated by said second light source and convert said light into a second source light beam propagating along said primary optical axis; - at least one light modifier (119, 215, 223) positioned along said primary optical axis, said light modifier being adapted to modify at least a part of said first and/or said second light beam; said light modifier reflects at least a part of said first and/or said second light beam; - a projecting system positioned after said light modifier along said primary optical axis, said projecting system collecting a part of said light generated by said light sources and projecting said collected light along said primary optical axis; - wherein said first light source comprises a light converting material, said light converting material being capable of converting light into longer wavelengths; - wherein said second light source generates light having at least one spectral component which can be converted by said converting material of said first light source; - wherein said first and said second light sources are mutually arranged in relation to said primary optical axis such that at least a part of said second source light beam hits said first light source after being reflected by said light modifier, characterised in that: - said second light collecting means (113b, 209d) is adapted to concentrate said back reflected second source light beam onto said first light collecting means (113a, 209a); and - said first light collecting means (113a, 209a) concentrates said back reflected second source light beam onto said converting material of first light source. - a first light source (111 a) and first light collecting means (113a, 209a), said first light collecting means configured to collect light generated by said first light source and convert said light into a first source light beam propagating along a primary optical axis; - a second light source (111 b) and second light collecting means (113b, 209d), said second light collecting means configured to collect light generated by said second light source and convert said light into a second source light beam propagating along said primary optical axis; - at least one light modifier (119, 215, 223) positioned along said primary optical axis, said light modifier being adapted to modify at least a part of said first and/or said second light beam; said light modifier reflects at least a part of said first and/or said second light beam; - a projecting system positioned after said light modifier along said primary optical axis, said projecting system collecting a part of said light generated by said light sources and projecting said collected light along said primary optical axis; - wherein said first light source comprises a light converting material, said light converting material being capable of converting light into longer wavelengths; - wherein said second light source generates light having at least one spectral component which can be converted by said converting material of said first light source; - wherein said first and said second light sources are mutually arranged in relation to said primary optical axis such that at least a part of said second source light beam hits said first light source after being reflected by said light modifier, - said second light collecting means (113b, 209d) is adapted to concentrate said back reflected second source light beam onto said first light collecting means (113a, 209a); and - said first light collecting means (113a, 209a) concentrates said back reflected second source light beam onto said converting material of first light source.