I posted photos of some LED red and green wing tip position lights here:

http://w1.lancair.net/pix/Lamina-LED-Positon-Lights

The LED arrays are from Lamina Ceramics.  These have a very wide illumination pattern,
essentially Lambertian, and are so bright that without any lens they meet FAA specs in the
forward direction.  The FAA specs require much lower intensity off the forward direction, so
these lights are way over spec for other azimuths.

I just used a series resistor to set the current. Keep it simple. One amp for the green, two for the red.

Note that the standard Whelen bulb also uses 2 amps so these create no more heat
than the bulbs.  They make a LOT more red or green light, however.

I will attach the LEDs to the aluminum heat sinks I made with thermal heat sink grease.

Also, you will see my strobes in the photos.  These are public service units I bought on E-bay.
I made a toroidal lens of D shape cross section to project more light into the azimuthal plane.
The lens was made from 1/2 inch plexiglas rod. I heated it with a heat gun and bent it into a curve.
I then cut the cylindrical inner surface on a milling machine with a fly cutter.

These are for my LNC2 (360), but a similar design would work for any lancair.

Cheers.

--
Jeff Peterson