The Series 55 Navigation lights are applicable for vessels > 20 - < 50 m in length. The Navigation lights fulfil all requirements of International Regulations for Preventing Collisions at Sea 1972 (COLREG) are published by the International Maritime Organization (IMO) and local rules. The high quality Series 55 with their nonmagnetic and seawater resistant polycarbonate housing are virtually unbreakable and extremely reliable. Even the tungsten bulb with socket BAY 15d can be changed easily.