Finally, a true one-to-one LED replacement bulb for incandescent navigation lights with festoon bulbs. This short festoon LED bulb is specially designed as a direct replacement for many combination masthead & anchor lights. It works in many Perko lights such as series 1123, 1124, 1125, 1178, 1181, 1183, 1184, 1196, 1197, etc. This high-quality high-power LED bulb is the perfect way to reduce energy consumption on your boat with a current draw of only about 0.1A. Its incredible reliability means an end to frequent climbs up the mast to replace navigation light bulbs.