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