Stealth Pilot writes:

charlie, assuming that you are using a 12 volt bus, all you need to do
to use an LED is put a 680ohm resistor in series with it.

Huh? You can't generalize about LEDs like that! There are many different
LEDs with different electrical characteristics. Given the OP's post,
you can't even state that a simple resistor is what he wants; he may
want variable lighting, in which case a potentiometer is what's needed.

If the OP doesn't get a reply from Weir, I suggest the Matronics
AeroElectric list at http://forums.matronics.com/viewforum.php?f=3

--
Too bad you can't just grab a tree by the very tip-top and bend
it clear over the ground and then let her fly, because I bet
you'd be amazed at all the stuff that comes flying out.
- Jack Handey