A color matching lamp , having - LEDs divided into three, four or more different groups having different wavelength ranges (B, R, L, W) of the emitted light, and - at least one color mixing device for homogeneous mixing of the light of the LEDs divided into different groups, wherein at least one color mixing device is a transparent pane , which is provided with a structure on the side facing away from the viewer, in which structure regions that are planar and parallel to the plane of the side facing the viewer alternate with such regions , the plane of which is not parallel to the plane of the side facing the viewer or is only roughened, characterized in that - the LEDs divided into different groups (B, R, L, W) are regularly arranged alternately on the side of the transparent pane and irradiate their light into a lateral edge surface of the transparent pane and into a lateral edge surface of the transparent pane opposite this edge surface , - the local area ratio of the regions which are not parallel to the side facing the viewer or only roughened to the regions parallel to the plane of the side facing the viewer to the center between the two opposite lateral edge surfaces at which light is irradiated, increases, wherein the regions are designed as a hexagon pattern, wherein bordered hexagonal regions are parallel to the plane of the side facing the viewer and become ever smaller towards the center between the two opposite lateral edge surfaces at which light is irradiated, and wherein the bordering lines of the hexagonal pattern are roughened or not parallel to the plane of the side facing the viewer and always have the same width, and contiguous surfaces of the regions of the side of the pane facing away from the viewer and structured are smaller than 1 mm 2 , preferably smaller than 0.25 mm 2 . - LEDs divided into three, four or more different groups having different wavelength ranges (B, R, L, W) of the emitted light, and - at least one color mixing device for homogeneous mixing of the light of the LEDs divided into different groups, - the LEDs divided into different groups (B, R, L, W) are regularly arranged alternately on the side of the transparent pane and irradiate their light into a lateral edge surface of the transparent pane and into a lateral edge surface of the transparent pane opposite this edge surface , - the local area ratio of the regions which are not parallel to the side facing the viewer or only roughened to the regions parallel to the plane of the side facing the viewer to the center between the two opposite lateral edge surfaces at which light is irradiated, increases, wherein the regions are designed as a hexagon pattern, wherein bordered hexagonal regions are parallel to the plane of the side facing the viewer and become ever smaller towards the center between the two opposite lateral edge surfaces at which light is irradiated, and wherein the bordering lines of the hexagonal pattern are roughened or not parallel to the plane of the side facing the viewer and always have the same width, and contiguous surfaces of the regions of the side of the pane facing away from the viewer and structured are smaller than 1 mm 2 , preferably smaller than 0.25 mm 2 . <EOS>