Hi, one of my customers had a condenstation problems with a plastic bulkhead light in a small walk in freezer, we replaced it with one that had a glass cover, which solved the problem. Ditto the shattering glass comment.
Also, going off on a tangent, I changed some lamps in some lowbays that were fitted in a very large drive in freezer store, they were over 10 years old, but looked like brand new, no signs of any rust or corrosion, the cold temprature seems to preserve.