I tested these bulbs before attempting to use them and they were 10 out of 10 in perfect condition. They will really be waterproof. I fitted it into the 3/4" hole as directed and following the advice of another buyer I read here I fitted the rubber grommet into the hole first, put some lube/water on the inside and then last the plastic backlight is used. Works very well. Very bright and quite wide viewing angles! Excellent for the money.
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