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