U327 (GE327) bulb

[David Mazer]

Does anyone know if there is an LED drop in replacement for the U327 bulb.  Mine seem to go out regularly.  They're cheap, $0.22 at SkyGeek but they just don't last very long.

[N601RX]

http://www.martekled.com/StoreFront.bok

[David Mazer]

Great.  Thanks.  Any idea if the center contact should be positive or negative?

 

Midget Flanged Based LED, T1-3/4 (5mm) Energy-Saving Miniature Lamp

[NotarPilot]

I was wondering the same thing. I imagine using a multimeter will be able to tell you. I'm going to check mine.

Does anyone know if it's legal to install one of these LED bulbs on a certificated aircraft?

[Jerry 5TJ]

Per the web site

 

http://www.martekled.com/-strse-173/%23327-flange-based-LED/Detail.bok

 

The GE327 direct replacement is available in center connector (+) or center (-) or in an AC version which would work no matter which way you've got the socket wired. 

 

They are $9 each so you can buy a lot of 327 bulbs before you break even.

 

    

[David Mazer]

Thanks.  I didn't realize the AC version would work in a 12 or 24 V DC environment.  That would make it easier.  The cost for the incandescent vs LED isn't the issue as much as reliability and power consumption.  Okay, power consumption isn't an issue either with these little bulbs but reliability is.

[Jerry 5TJ]

The GE327 is a 28V bulb.  Use the GE330 for 12V applications. 

[David Mazer]

Right, I knew that.  The real question, even if poorly asked, is the AC vs DC aspect.