All light fixtures inside the hot room should be sauna rated. I don't know how that works outside Finland, but I'm sure any ceramic lamp base would be better than a plastic one. And please don't forget about the IP rating.
All light fixtures inside the hot room should be sauna rated. I don't know how that works outside Finland, but I'm sure any ceramic lamp base would be better than a plastic one. And please don't forget about the IP rating.