I think I remember that UV B and C are pretty much blocked by ordinary glass so it is only UV A that would get through the normal lamp globe. I assume it would be easy to filter the A if they really thought it was an issue.
I suppose the real question is how much gets reflected by painted surfaces. I doubt anyone actually has bare bulbs that you can see in their lighting plan. We really try to bounce the light off the ceiling or wall to soften the glare.
Most people think we have a pretty dark house anyway.
