an output reflective layer located on the output surface to partially reflect light toward the input surface and partially allow {TAIL ~ light} to pass through the output reflective layer and the output surface, with the reflectance of the output reflective layer being graded across {HEAD ~ the length} of the beam directing member to produce less reflection as the reflective layer extends away from the light entering region; and 
an output reflective layer located on the output surface to partially reflect light toward the input surface and partially allow { TAIL ~ light } to pass through the output reflective layer and the output surface , with the reflectance of the output reflective layer being graded across { HEAD ~ the length } of the beam directing member to produce less reflection as the reflective layer extends away from the light entering region ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH