I would be looking at the regs to see how the spaces are measured and see if I could create 1" high ceilings for some spaces that are pitch black (and stack those spaces) so that I could use more lighting elsewhere.
It doesn't work that way, you can't just define arbitrary spaces. They have to be actual habitable rooms, which means a minumum ceiling height if 6.5-7' in every jurisdiction I know of.
