The control system uses {HEAD ~ the output} of {TAIL ~ the subareas} for controlling the luminaire light output 
of
The control system uses { HEAD ~ the output } of { TAIL ~ the subareas } for controlling the luminaire light output
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH