 This is essentially the same process used in fluorescent lamps, except for the use of an LED to create blue light rather than excited gas plasma to create ultraviolet.White LEDs can be used as white holiday lights or to create any other color through the use of colored refractors and lenses similar to those used with incandescent bulbs.Color fading may occur due to the exposure of colored plastics to sunlight or heat, as with ordinary holiday lights.