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+1 for the dielectric grease.

I have run a lot of aftermarket LED accessories (interior/exterior) over the years and have always used a dab of clear silicone on anything that would be exposed to water. Before mounting the hardware, run a thin bead of clear silicone on the exposed seams/edges, let it sit for 24 hours and then trim excess/overflow. Have never had an issues with water ingress in 15+ years.

On the other hand, had the OEM headlights on our 3rd Gen replaced under warranty within 18 months due to excessive moisture whenever the Van went through hard rain.
 
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