All of our replacement LED lamps are equipped with a built in voltage controller (Buck Power Converter) to compensate for the variable voltage that occurs in the marine environment being powered by storage batteries. This circuitry ensures maximum brightness and maximum operating life. Only recently has LED technology advanced to the point of offering brightness and reliability that meets or exceeds that of traditional bulbs and at an affordable price. Now our customers can equip their boats and RV's with a lighting system that will use only 10% of the power of halogen and incandescent bulbs and provide equivalent or brighter light.