AeroLeds
AeroLeds has a variety of wingtip lighting suitable for RVs, including landing/taxi lights. I just upgraded a duckworks 55w halogen fixture to an AeroLed PAR-36 LED bulb. Took about two hours to modify the mount and install. Take a look at the Aerosun Vx which may be the least "builder-needed" upgrade for your plane.
I have had top service from AeroLeds company, including one instant replacement for a landing gear LED light installation that I did on an earlier plane. Their technical advice is super. Most importantly though, the products are as-advertised, durable, and available.