If your ceiling or wall is insulated, it's rarely necessary to caulk your light fixture against cold air. The same goes for interior walls. If your ceiling or wall isn't insulated, or if you feel a draft despite the insulation, consider running a bead of caulk around the edge of your light fixture.
How do you seal an outside light?
https://www.youtube.com/watch?v=JzI2WgsovcQ
How do I waterproof my outdoor light fixture?
One of the easiest ways to waterproof outdoor lights is to apply an extra silicon seal (caulk) during installation. There are other methods such as choosing high IP-rated fixtures or using light shields. In addition to a watertight lamp, you also want the outlet to be secure.
What do you seal outdoor light fixtures with?
The primary benefit you'll achieve from caulking your outdoor lights is keeping water from jeopardizing the components. You'll also keep dirt and bugs from entering the light, too. Choose a silicone caulk for this job; it's water-resistant and won't crumble, crack or shrink.
How do you protect outdoor lights from rain?
https://www.youtube.com/watch?v=juEmMWffRPk
How do I stop my outdoor light fixture from rusting?
Seal leaking skylights by spraying a few coats on all suspected leaking joints. Protect any steel surface from corrosion. Seal electrical light fittings from corrosion, dramatically extending the life of these fittings. Simply spray a few coats in the connection and on the bulb fitting.
Do you need to seal exterior lights?
Rain will often find its way into a wall if the exterior light fixture is not properly caulked. Therefore, proper caulking will help prevent water from entering into a wall; helping prevent damage and mold.