They should have black flexible plastic "seals" on the bottoms. I had one with water in it and found it was actually a flawed screw hole that was leaking. I put nylon washers under all the screws, and they've stayed dry ever since. Be careful not to over tighten the screws in their plastic roof inserts.Are those light housings supposed to have seals on them? Mine don't and I noticed last week that there's moisture in a few of them.