the ballast rail comprises a collet for securing the ballast rail to the housing for providing enhanced heat sink effects for {HEAD ~ the ballast} attached to {TAIL ~ the ballast rail}, 
the ballast rail comprises a collet for securing the ballast rail to the housing for providing enhanced heat sink effects for { HEAD ~ the ballast } attached to { TAIL ~ the ballast rail } ,
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 REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH