I always imagine that any special colored spotlights are the result of odd devices hooked to the ceiling that have super bright LED indicators on the bottom. So if you looked up, imagine one of those bell-shaped things that you see stuck to the side of the hallway but now clamped vertically to the ceiling with a big colored LED or indicator panel that gives off a more or less directional glow of light
YMMV of course.
I'm not sure which hole in the floor Bob is referencing. The only one I remember is the one where pipes are being fed through it in "Charlie X". Is that the one Bob?