Dan,
Perhaps the problem is in finding TSO wingtip nav lights using LEDs. Try these: http://www.whelen.com/aviation/catalog/Position%20Light%20Assemblies.pdf or http://tinyurl.com/5g4u7h Kuntzleman makes a nice set of them, but his are not TSOed. http://www.kestrobes.com/ Can you get the FAA to sign off on a form 337 for using non-TSOed position lights? Ed
