{HEAD ~ The reflection board} can be located adjacent and extend along the one flat surface of {TAIL ~ the light guide} 
{ HEAD ~ The reflection board } can be located adjacent and extend along the one flat surface of { TAIL ~ the light guide }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL