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