Peterson 415k - Sealed, 4" round clear light that functions as back-up or utility light. Fully automated manufacturing process ensures consistent quality and reliability. Features extra wide, spin-welded, tongue-and-groove lens lipand waterproof seal. High performance, copper alloy conductorseliminate the possibility of wire failure. State-of-the-art bulb design features three supports for the minor filament and two supports for the major filament providing long bulb life. Wedge-base socket prevents premature bulb failure.