This might not be a direct answer to your question but I believe the wing tip lights in RV are not as effective as leading edge lights due to the angel that they will be mounted to. I had a very bright LED light in my wing tip and though had angled them inward as far as they could go, it was hard to point them center and close. A leading edge light can be directed more towards the center.
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Phase one