I tested these bulbs before attempting to use them and they were 10 out of 10 ok. Each one is sealed well to seal the +/- wires so I'm sure they really are waterproof. I installed in a 3/4" hole as directed, and following the advice of another buyer I read here, I first installed a rubber grommet in the hole, put some lube/water on the inside, and then the Plastic lantern used. It worked very well Good Very bright and quite a wide viewing angle! Very good for the money.
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