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Rick, cut the tile so that the led is a snug fit and then a small smear of sanitary silicone around the led as you insert it will make a waterproof seal that will last years.

Dont use any kind of decorators caulk. Only sanitary ware silicone is 100% waterproof. Its what all glass aquariums are stuck together with.
When (not if) the led fails, a thin sharp blade will cut the silicone and you can replace the failed bulb.
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