marine double-deck masthead light Visibility:6n.m Level arc:225 degree Lamp holder:P28S Enclosure:IP56 marine double-deck masthead lightThe lamp fit for the ships with the length 50m or above 50m as lamp signal when night navigation, conform to CONVENTION ON THE INTERATIONAL REGULATIONS FOR TRVENTINGS AT SEA, 1972 AND TRADE ENRTY AND BUILDING NORMS FOR STEEL SHIPS, and are approved by CCS(China ...