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