I did this a while ago but seem to be getting a lot of private messages on finding it, so I've consolidated the pictures and will be making a "how-to" in its own thread which can be searched. This is a purely informational post about the possibilities of LEDs and is tested on a grounded aircraft and is no way airworthy pending your IA, local FAA DAR, or 337 modification. This requires rewiring and removal of the old overhead rheostat that controls the lights.
Approx time to complete: 2-4 ho