I've got a red light that comes on for certain things, like low light work (so don't open the door) or dangerous equipment in use (so don't come in, unless you hear screaming followed by silence and blood running under the door. But hit the kill switch before entering). The can lights are all on one switch like yours, which is always on, and has a cap to prevent accidental switching it off. We have 4 lights on it, the one outside the lab is a colored light, it turns res automatically when certain devices go live, or I manually indicate Do Not Disturb. Easy. The cap over the wall switch prevents accidental flipping the switch, but does allow someone to do it reaching to the side of the cap, for example of ST isn't working they can still manually flip the switch off then on to turn the lights on. Easy.