A color wheel for an aluminum Christmas tree is a device used to shine a spotlight on the tree branches. Strings of lights on an aluminum tree are considered a fire hazard so the color wheel is provided for illumination. Most are placed on the floor, though some are wall-mounted.
Color wheels feature several colored plastic segments on a wheel that rotates. The projected light causes the tree branches to change color. This is often combined with a motorized rotating tree stand. Varieties of color wheel cases include plastic, metal and glass. Aluminum Christmas trees became popular in the early 1960s and are now a collector's item.