A white light source comprising an array of non-white light emitting elements each of said light emitting elements being arranged to provide, in operation, a divergent light beam, said array of light emitting elements being arranged to a light guide comprising at least a first surface and a second surface facing said first surface, characterized in that: - said light emitting elements are arranged on a substrate comprising at least one electrical conducting wire connected to said light emitting elements; - at least a light incoupling array comprises light incoupling elements arranged on said first surface, each of said light emitting elements facing a light incoupling elements; - said substrate is separated from said first surface by at least a gap layer; - said gap layer has an effective refractive index at least 0.2 lower than the refractive index of the light guide; - each of said light incoupling elements are arranged to incouple in said light guide a portion of said divergent light beam, said portion defining an incoupled light beam, said incoupling elements being further arranged so that the in-coupled angle of at least a part of the light rays of said in-coupled light beam are higher than 45°, said in-coupled angles being defined relative to the normal (N 1) of said first surface; - at least an array of light homogenizing elements is arranged on said second surface on said second surface, each of said light homogenizing elements facing a light in-coupling element, said light homogenizing elements being non-uniform structures arranged so that the deflection angle of at least a fraction of the incident part of said in-coupled light beam incident on each of said homogenizing elements is higher than 45°, said deflection angle (δ) being defined as the absolute sum of the incident angle and the reflected angle of a light ray of said incident part, both angles being defined relative to the normal (N 2) of said second surface; - said white light source being arranged to provide at least a uniform outcoupled white light beam emitted to at least the side of said light guide opposite to said first surface. - said light emitting elements are arranged on a substrate comprising at least one electrical conducting wire connected to said light emitting elements; - at least a light incoupling array comprises light incoupling elements arranged on said first surface, each of said light emitting elements facing a light incoupling elements; - said substrate is separated from said first surface by at least a gap layer; - said gap layer has an effective refractive index at least 0.2 lower than the refractive index of the light guide; - each of said light incoupling elements are arranged to incouple in said light guide a portion of said divergent light beam, said portion defining an incoupled light beam, said incoupling elements being further arranged so that the in-coupled angle of at least a part of the light rays of said in-coupled light beam are higher than 45°, said in-coupled angles being defined relative to the normal (N 1) of said first surface; - at least an array of light homogenizing elements is arranged on said second surface on said second surface, each of said light homogenizing elements facing a light in-coupling element, said light homogenizing elements being non-uniform structures arranged so that the deflection angle of at least a fraction of the incident part of said in-coupled light beam incident on each of said homogenizing elements is higher than 45°, said deflection angle (δ) being defined as the absolute sum of the incident angle and the reflected angle of a light ray of said incident part, both angles being defined relative to the normal (N 2) of said second surface; - said white light source being arranged to provide at least a uniform outcoupled white light beam emitted to at least the side of said light guide opposite to said first surface.