a target surface arranged at a distance from {HEAD ~ the lighting module} to receive a uniform distribution of {TAIL ~ the partially collimated light} 
a target surface arranged at a distance from { HEAD ~ the lighting module } to receive a uniform distribution of { TAIL ~ the partially collimated light }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL