wherein {HEAD ~ the light} emitted from {TAIL ~ the secondary light source} is prevented from entering the light emitting plate 
emitted from
wherein { HEAD ~ the light } emitted from { TAIL ~ the secondary light source } is prevented from entering the light emitting plate
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH