Christmas tree lights are decorative lights used to decorate Christmas trees, interiors and buildings during Christmas. They usually consist of a string of small bulbs or LEDs that emit light in different colors. They can have different lighting modes, e.g. constant light, flashing or transition effects.

Christmas projectors are devices that display various Christmas patterns and light effects on surfaces (e.g. house walls, ceilings, trees). They are a great alternative or complement to traditional Christmas tree lights and other Christmas decorations.