No bulbs inside LED lit.
No, I'm not saying there hermetically sealed. But for all intensive purposes they are sealed units. The glass face is glued on with a windshield type butal rubber sealant and once the wire connections are installed in the back they are water tight. There for sealed unit. If moisture is trapped inside it will always fog. This water must be removed and unit resealed. The most likely leak area is a wire connection hence the dielectric grease on the seals on the wire connection.