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Author Topic:   LED Lightbulb to Replace Threaded-base Incandescent Lightbulb
jcdawg83 posted 07-08-2014 03:12 PM ET (US)   Profile for jcdawg83  
I purchased a [combined sidelight lamp] for my 1977 Montauk last year from Specialty Marine. The bulb was a [incandescent], screw-in, 12-Volt bulb. The bulb burned out after about one year. I have never had a [navigation] lightbulb burn out before, I guess the lightbulb was not exactly top quality. Finding a replacement bulb has been quite the ordeal. Apparently, small, screw-in 12-Volt lightbulbs are not used on much of anything other than this lamp.

I have ordered an LED replacement lightbulb from Specialty. Does anyone have any experience with replacing an [incandescent] lightbulb with an LED? The girl at Specialty--very nice and helpful by the way--said all I need to do is screw in the new lightbulb and everything should work fine.

jimh posted 07-08-2014 03:21 PM ET (US)     Profile for jimh  Send Email to jimh     
Most of the miniature incandescent lightbulbs used on boats are bayonet-base. I think the bayonet-base type is used because of vibration. A threaded-base lightbulb might slowly loosen under vibration.

It sounds like you are buying the replacement LED lightbulb from the same vendor that sold you the lamp. I would assume it is going to fit and work.

I agree with your implied comment: modern incandescent lightbulbs made in China do not last nearly as long as incandescent lightbulbs made in the USA in the 1950's.

jimh posted 07-08-2014 03:44 PM ET (US)     Profile for jimh  Send Email to jimh     
Typically an LED lightbulb will not draw as much current as an incandescent lightbulb with the same light output. The result is the power consumption goes down. Also the voltage drop in the branch circuit goes down. These are bonuses.

There is a notion that an LED lightbulb will last longer than an incandescent. That is the theory and the promotion. Whether that obtains in practice is to be demonstrated.

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