The diameter of LED Rainbow Light is ¦µ16mm. Since it is bigger than the traditional 2-wire, 4-wire and 5-wire Rainbow Light, the glimmering effect is much more attractive. Inside the light, there includes single-return light string or multi-return light string. Consequently, it could show the multicolor effect coupling with a controller. The effect is outstanding when the light is used in building exterior outline, bridge, garden, disco hall etc. While using in building exterior outline, compared with the Round or half-cirele Railing Protection Light, the LED light becomes much more practical and safe. Due to its unique advantage in low energy consumption, its connecting length is up to kilometers without cutting the power off.