When I checked out Aqua Signal's bow lights, I found feedback saying the plastic units were cheap looking, poorly built and did not seat properly. At this point, I'm going to stay with the Perko lights I have since they work. I did drill a tiny air hole in the back of the starboard light to see if that might help reduce the moisture inside it. And I caulked both light pretty thoroughly.
2006 34' PDQ PowerCat "All Heart", Bellingham WA