{HEAD ~ The heat} conducted to the projection portion 42 is efficiently conducted from the end face 43 of the projection portion 42 to the fixture body 12 and radiated into {TAIL ~ air} 
is radiated into
{ HEAD ~ The heat } conducted to the projection portion 42 is efficiently conducted from the end face 43 of the projection portion 42 to the fixture body 12 and radiated into { TAIL ~ air }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL