The grounding (or lack there of) worries me the most. The transformer case running at 7.5 KV or even higher will be a nasty surprise.
But another issue with using a lighting fixture to supply a receptacle is the fact the wiring inside the fixture was designed to power a 60 or 100 watt lamp and will be 18 AWG. Connect a receptacle to those 18 AWGs and start loading them up....somethings going to melt.
