Outdoor holiday light projector – The vintage aluminum Christmas tree is a classic. This tree has a retro look to it. There are few options for lighting, because string lights can cause a fire or electrical shorts. The original version of these wheels shows how an aluminum Christmas tree sparkles. Color Wheel is a halogen spotlight four colors. As the wheel spins, the colors are reflected on the plant. The colors usually alternate between red, green and yellow. LED color wheels are a better alternative to the traditional. LED color wheels are really a spotlight with a collection of colors.