I had dinner with a Vista rep last week and he was telling me about some guys having some problems with their underwater lights filling up with water. They checked the seals and they were working fine. What they discovered was the insulation jacket that the wires are encased in also has that little bit of string we all find annoying. What was happening was that the wires were sealed fine but the opening to the jacket was laying in the soil and in fairly wet locations was wicking up to 2 teaspoons of water back into the light fixture every day via the string. So much for those bulbs. Anyway probably a good idea to stick these exposed jackets in a DBY. Anybody else run into this?