They were advertised as waterproof - which does not mean anything. However, i opened the casing when i got them and the main electrical area has a rubber seal around it. Additionally, the light fixtures themselves have plastic coverings around the connections. It's not likely they would work under water or anything, but I think they're more waterproof than hardware store lights.
Either way, I don't think i could get the humidity to be high enough to be a problem anyway. The only concern is where the bulbs attach to the fixture, and a little humidity up there will not cause a short (because the other terminal is 2 feet away). It's something to think about though. I will probably take them apart again, and look up the manufacturer specifications before i do anything.