I love it and so does my DH. We had a family friend that we were very close to called Lux and she died recently and we'd like to use the name but have no idea what other peoples reactions would be. She was the only Lux I'd ever met so I assume it isn't a popular name.
I know it was a character name in Virgin Suicides which doesn't bother me, I like the film. There was a detergent called Lux too, but I doubt many under 20 years old would have ever heard of it now so don't think that would be a problem when baby is older if you see what I mean.