The Osculati bicolour navigation light has a white plastic case and is suitable for vessels under 20 metres in length using either 12 or 24 volt electrical systems. This nav light utilises LED technology to produce a 225° arc of bright LED light, which is more energy efficient and has a longer life than standard bulbs. For a spare 12V LED bulb please use part numbers 731728 (red) and 731729 (green).