Upgrade your vehicle's lighting with Grand General's 4" Prime LED Sealed Light. LEDs are brighter and have lower ampere draw making it possible to add more lighting without upgrading your charging system. 4 inch round lights are commonly used size in heavy and medium duty trucks. This red 4 inch round sealed LED is used for stop/turn/tail functions and uses 3-pin light adapter (included). The light is DOT (Department of Transportation) compliant for street legal lighting and is an excellent value choice.