Attwood Portable LED Boat Stern Light w C-Clamp Mount This Portable LED Boat Stern Light w C-Clamp Mount features a fully buoyant molded one piece white body design with a removable lamp carriage assembly. Rated at 100,000 hours of LED service life, it uses 90 less energy than incandescent bulbs. With molded brass threaded mounting bushings, a sealed heavy duty onoff switch, and shock resistant neoprene accents, this boat stern light is designed for boats less than 22ft. in length with a maximum