Actually, there are reliable reports that Tesla didn't use any recognizable lighting elements in his lab. Witnesses all claim that he simply flipped a switch and the room lit up, but no bulbs or anything similar were in evidence. He demonstrated the effect at an exhibition in Paris as well by placing some kind of generators on either side of a stage, firing them up, and VOILA! the stage got light, without any noticable illumination coming from the generatirs themselves. As far as I know, this trick has never been duplicated.
