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