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The led's one maybe better as they're more of a sealed unit
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As someone who's been using LED trailer lighting for several years, I can reply that "some are, and some aren't", despite the advertisements.
My normal procedure upon obtaining new lights is to caulk every seam and potential opening (using normal household silicone caulk, as I usually have it around.) This has cut my fixture replacement to about a third of what it was.
jky