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