A buoy and lighthouse for tough conditions. The lantern's high efficiency and robust design make it ideal for buoys and lighthouses in exposed places with harsh weather conditions. The lantern is designed to work for 10 years without maintenance. The lens is cast in one piece in UV-stable polycarbonate, which guarantees a lasting brightness and minimizes the risk of the lens fading or discoloring as it ages. Compared to a traditional 85mm lantern with filament, LED 155 shines about 5 times brighter at the same consumption. Up to three floors with diodes.