A sealed unit is imo better than an open one in any location with steam/condensation. The choice of sealed unit is another matter, a normal ball type one might have been more aesthetically pleasing.
I think it's more to do with building regs rather than electrical ones..
on new builds, at least one fitting has to be of an energy saving type, so either a special pendant that takes a funny lamp, or in most cases, some form of fluorescent is used in the bathrooms where you are less likely to want a lampshade... ( and can't use pendants anyway, must be batten holder type.. ).
the council probably use this spec in rewires on their housing stock too.. ..
Yes I agree that a light fitting that is designed for steamy and moist enviroments is a better solution but any light can be installed in a bathroom providing the lowest connection of conductors is above 2.25m
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