Uh, I made some rooms in my quest dark. Unfortunately, when the lights go out, you can still see the floor just fine, such that it is rather pointless to make the room dark. Anyone know why?
And the majority of the room uses cset 2 if this helps. Some parts use csets 3 and 4 though, and those parts darken correctly.

edit:
Never mind. It fixed itself. I couldn't for the life of me tell you why though.