Grand General's premium quality Spyder LED light bars are a great choice to dress up your ride with bright LEDs. Each individual diode has a round spider web reflector design giving the light a high-end custom look and superior light distribution. LEDs are brighter and have lower amperage draw making it possible to add more lighting without upgrading your charging system. 4 inches round lights are a commonly used size in heavy and medium duty trucks. This dual high/low function 4 inches round Spyder LED light is DOT (Department of Transportation) compliant for street legal lighting and uses a standard 3-prong pigtail.