They advertise them as easy to reopen to modify again if you decide. Looking at the eBay pics, it looks like the lenses may screw on. I'm sure sealing them up well would take care of any possible moisture issues. And obviously if they're being retrofitted then the light output wouldn't matter either, since the projectors would solve any issues there. My only real concern would be if they fit the truck well. There were pics on one of the Amazon reviews for another model, and the fitment looked terrible. I'll see if I can find it