{TAIL ~ The improvement} 1, wherein said adjusting means further comprises a light shielding member restricting the amount of {HEAD ~ light} leaving said main reflecting means 
{ TAIL ~ The improvement } 1 , wherein said adjusting means further comprises a light shielding member restricting the amount of { HEAD ~ light } leaving said main reflecting means
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH