Aqua Signal 12/24 Multi-Voltage, Series 43 LED Starboard Navigation Light, Black Housing, 3.875"W x 4.25"H x 2.375"D. These lights are the optimal LED replacement for Aqua Signal Series 40 and 41 lights. Direct ?drop-in? replacement for Series 41 lights. To directly replace a Series 40 light, you will need to screw Mounting Plate #43901-1 to the rear of the Series 43 fixture (sold separately). Highest durability with completely sealed polycarbonate housing and electronics with IP67 rating. Energy efficient LED technology significantly reduces power draw compared to incandescent lights. Exceedes visibility requirements, adding a redundant safety factor. 2 nautical mile visability for vessels to 164 feet.