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Old 17-01-2017, 11:30   #1
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LED replacement for 12v21c bulb

Hey there,

Does anyone know of a drop in LED replacement for a "12v21c" bulb? I'm converting my cabin lighting to LED and this is the one bulb I'm having a hard time finding an LED replacement for. Looking for something that's pleasing to the eye at 2700k or 3000k...

Photo attached of the bulb I'm looking to swap out.

Thanks in advance.

Ryan
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Old 17-01-2017, 12:13   #2
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Re: LED replacement for 12v21c bulb

Check out Bedazzled in the UK. They have a very extensive line of LED "bulbs" and we have been very happy with their quality and service.

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Old 17-01-2017, 12:31   #3
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Re: LED replacement for 12v21c bulb

Does it say 'BA15a" or "BA15d" anywhere? That bulb looks to me like a standard (at least in the US) bayonet bulb.

I'll also provide you with a source in the US!

https://store.marinebeam.com/bayonet...or-exterior-1/
I think I am purchasing the 23-LED Constellation Matrix to install in all my domes. I hesitate because I'm not sure if it will be too bright...

For what it is worth, MarineBeam makes quality gear. Perhaps at the higher end of the price point, but thus far they (nav lights) have been good to me.
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Old 17-01-2017, 13:03   #4
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Re: LED replacement for 12v21c bulb

I bought a dozen or so off of Ebay years ago cause I was trying to save a few bucks.
Turns out they are reversed polarity, I would have had to reverse the polarity on all of my fixtures.
I bit the bullet and bought Marine beams instead, their color temperature was correct and correct polarity, warm white as opposed to the harsh blueish white of most LED's.
I believe also many cheap LED's cause a lot of radio noise
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Old 17-01-2017, 13:30   #5
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Re: LED replacement for 12v21c bulb

The Sensibulb is one of the best, but not cheapest, LED cabin lights go'in. Adapters are available for bayonet bulbs like yours, just check if the base of the bulb has one contact or two. You can get them at SailorsSolutions.com.
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Old 17-01-2017, 13:32   #6
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Re: LED replacement for 12v21c bulb

Check this site: 12v LED Replacement Bulbs - PPL Motor Homes It's the one I used when doing some LED replacement therapy. You'll probably be able to drill down and find it.
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Old 17-01-2017, 13:47   #7
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Re: LED replacement for 12v21c bulb

www.superbrightled.com
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Old 17-01-2017, 14:37   #8
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Re: LED replacement for 12v21c bulb

If it is the BA15d try Amazon. Just bought 10 of them for $48.
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Old 17-01-2017, 15:14   #9
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Re: LED replacement for 12v21c bulb

Lunasea. That looks like a standard b15 socket. Is it 1 contact or two? Single socket are fewer in choice from the marine led suppliers.

We used a lunasea single socket for our reading lights. Didferent form factor with a short cable and flat panel led matrix.

We use cold white 3W for detail and 1W warm for ambience.
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Old 17-01-2017, 15:45   #10
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Re: LED replacement for 12v21c bulb

I just converted all of the indoor lighting on our Hunter Legend 40.5 to LED with good results.

G4 bulbs are available for $7.99 for 20; adapters are available for $15.98 for 5:

At these prices, you can keep ample spares. G4s are the lease expensive bulb type, and using a single bulb type makes inventory and replacement easier.
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Old 17-01-2017, 18:42   #11
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Re: LED replacement for 12v21c bulb

Awesome. Thanks so much everyone. I'm going to order a BA15d or two on Amazon and see if they fit. Sure look like they would.... I left the darn things on the boat down on the Chesapeake, so I'm trying to wild guess what might fit from here in NYC.

The only thing written anywhere on it is 12V21C. Here's another shot of it.

It looks a lot actually like a standard automotive tail lamp bulb...
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Old 17-01-2017, 18:48   #12
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Re: LED replacement for 12v21c bulb

Of course, I took 5 pictures of the darn thing and not one of the bottom so I can see the contacts on the bottom....

FWIW this is the old light fixture... Probably original circa 1982.
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Old 20-01-2017, 10:04   #13
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Re: LED replacement for 12v21c bulb

I have similar in my '83 Cooper Banner. They are the two contact type, but a pic of the contacts would help us with suggestions.
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Old 21-01-2017, 06:11   #14
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Re: LED replacement for 12v21c bulb

Greetings and welcome aboard the CF, hafa.
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Old 24-01-2017, 01:45   #15
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Re: LED replacement for 12v21c bulb

Quote:
Originally Posted by GordMay View Post
Greetings and welcome aboard the CF, hafa.
Thanks! Quite a bit to read here, so posts will likely be few and far between for the nonce...
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