Replacement Indexed-Bayonet Incandescent Bulb
Bulb Supplied for 12-32 Volts DC and 120 Volts AC
U.S. Coast Guard Certified for Navigation Lights
Navigation lights are one of the most critical safety systems on your boat. These bulbs are BAY 15D Bayonet replacement bulbs for Aqua Signal Series 40, 41, 42, 50 and 55, and are offered as direct replacements for the Aqua Signal incandescent bulbs certified for use with the above Aqua Signal Series navigation lights.
Note: Navigationlights are certified as a housing/lens/bulb combination. The USCG only approves the entire fixture including the bulb through third party testing. Change to any of those components with a part that is not original and the light is no longer certified.