Feng teaches characterized in that said driver circuit board (Figs. 2-4; 60 power panel) is welded to an edge wire (66 second elastic component is welded through 662 fixing end to 60); said edge wire (66) is of a bendable structure (66 second elastic component; page 6 second full paragraph); when said driver power supply (60) is installed inside the hollow structure of said insulation sleeve (20 insulator foot), said edge wire (66) bends and extends out of the outer wall (see fig. 3; bends outside 28) of said insulation sleeve (20).