In another practical embodiment of {HEAD ~ the lamp} according to {TAIL ~ the invention}, the discharge vessel has an identical construction 
according to
In another practical embodiment of { HEAD ~ the lamp } according to { TAIL ~ the invention } , the discharge vessel has an identical construction
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH