The light sources may be {HEAD ~ light emitting diodes} or other standard light sources that can be contained in the handle of {TAIL ~ the delivery tool} 
The light sources may be { HEAD ~ light emitting diodes } or other standard light sources that can be contained in the handle of { TAIL ~ the delivery tool }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL