Also in some embodiments, {HEAD ~ the light sources} are selectable as individual sources or in {TAIL ~ combination} sources used in conjunction 
are selectable in
Also in some embodiments , { HEAD ~ the light sources } are selectable as individual sources or in { TAIL ~ combination } sources used in conjunction
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH