/ 25W. Base Type BAY 15d. Double Contact Bayonet Base Offset Pins. Bulb
Length 2 5/8", Bulb Diameter 1". For Aqua Signal Navigation Light
series 40, 41, 42, 50, 55.
Nav lights are certified as a
housing/lens/bulb combination. The USCG only approves through third
party testing, entire fixtures including the bulb. Change to any of
those components with a part that is not original and the light is no
longer certified. The bulbs that are offered are the direct
replacements of Aqua Signal incandescent bulbs certified with the light.