I ran RDX lights for the past 3 years. They have worked well. The biggest complaint with the RDX's from me is that the front DRLs are quite dim. Unfortunately, I hit the right rear light with the OBA tank (long story) about 4 months ago, and basically popped a hole into the acrylic cover.
Just recently I switched over to Wipacs, so I removed the busted light. With 4 months of rainwater in the lens, I gave it 14V and it lit up - three emitters were dead, two were very dim.
Just for fun, I filled the remainder of the lens full of tap water and ran the light for a half hour. Another emitter went dim, but otherwise no real change.
Then I cut open the lens and drained it of water. After leaving it on for an hour, the two dim LEDs returned to full brightness, although the three dead emitters stayed dead.
So overall I'm actually surprised how robust the LED wiring of the RDX lights are. I would have expected the PCB to totally short out under full immersion, but I guess they're somewhat reliable given some abuse. I wish the lenses were more impact resistant, but I think it's a downside of using acrylic in these lenses. I don't think the Wipacs are any better in this respect.
Just thought some of you might find it amusing