A second reflecting surface of {HEAD ~ an ellipse group} reflecting {TAIL ~ surface} such as a rotated elliptic surface having a first focus located substantially on the light source and having a second focus at a predetermined position 
reflecting
A second reflecting surface of { HEAD ~ an ellipse group } reflecting { TAIL ~ surface } such as a rotated elliptic surface having a first focus located substantially on the light source and having a second focus at a predetermined position
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH