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