I would be content with labs and military complexes having the “red light” emergency lights on. Bright enough for you to make out where you’re going, but not bright enough to distinguish fine details. I don’t know how indepth the light system is, but having zombies as black Zs that are unrecognizable, and perhaps the tables of items would require the player to be closer before being able to view the items… however, this could quickly turn into implementing the entire concept of stealth.
Yeah, something similar to that will probably end up going in with the stealth system. For now sight basically works on a can see/can’t see basis; either a tile is completely lit up or it’s pitch black to the eyes.