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