Since the bug thread is locked, I guess I need to post this here.
There is a problem with lighting bricks that are not completely within your visibleDistance, I took a few screenshots.
With the visible distance set to 10, the baseplates on the floor and ceiling appear completely black even though they are not.
With the visible distance set higher (100 or so), the baseplates' color returns to them.
I hope Badspot can look into this sometime.