Even halogen lamps with the straightest spectrum will cause problems in the brightest colors. It is not only the spectrum that has to be even. The light intensity must be very high in order to avoid deflection against red. Lamps that provide sufficient brightness warms too much. Therefore, neutral daylight is the only thing that is useable. It has an even spectrum and it is very strong. However, it is not always easy to find. Partly for that reason, we have developed PaintMaker so you can rely on your color mixes even when lighting conditions are bad.