Perko Universal Replacement Boat Stern Light This Perko Universal Replacement Boat Stern Light provides exceptional performance and looks good on any boat. It is designed for extreme durability and long lasting use with its locking and large threaded collar. With an included 12 Volt bulb, this alpha series universal boat stern light is certified for use on sail and power driven vessels under 20 meters 65.6 ft. in length. Features Locking Collar Large Threaded Alpha Series Universal Pole Light Ce