What I have seen on many prefab booths is the standard flo troffer is mounted on the outside of the booth and the light shines through a plexi panel that is cut into the steel and has been bolted and sealed inplace. My guess is that all of this is to keep the classified area inside. All of the electrical outside is then run with EMT or MC whips.
Also, every booth includes a compressed air interlock with a 5 sec delay. I presume this is to allow the sprayer to finish the pass before air is shut off if someone opens the door.
