OR-SIGN safety signs that come with the OR Package are illuminated warning signs designed to alert personnel entering the operating theater that direct UV disinfection lightis being used inside the room. Any time the UV fixtures in the room are energized, the warning sign(s) illuminate with a "CAUTION UV LIGHT ON" message.
Mounted outside the OR next to or above all of the doors 
Any lamps lit = warning signs illuminated  
In addition to this bold visual indicator, each and every UVC fixture in the room is an "intelligent" fixture with its own Motion + IR sensor.  If any fixture were to "see" motion or sense heat in the space during a full disinfection cycle, all of the fixtures will immediately shut down, and the fault will be recorded as part of the data logging.  
Motion + IR sensors are active in the Disinfection Cycle modes (both manually initiated and timed cycles)
Motion + IR sensors are deactivated in the Procedure mode as the room is occupied.  
In either mode, when the lamps are lit, the warning sign(s) will be illuminated.