No, the lamps are not sealed at all. The 'drainage holes' (kinda like a pair of mini scoops) are in the clip that you unscrew to get access to the bulb. No rubber grommet or anything. Then under there is a 1/4" square hole into the reflector housing, where the bulb is located behind a black metal light-blocker (what would you call that?) to not be able to see the bulb itself but to only allow reflected light out the front. Owell - the price was right so I'll give 'em a shot...