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