So I've been experimenting with creating high voltages and have a circuit generating 1kv ac, 20khz, about 40 watts. I hooked it to a 20w fluorescent tube, and it lights, but the arc inside moves in a spiral motion along about half of the tube. I know I'm pumping more power than its rated for, it was a burned out tube from my old kitchen counter lights so I don't care if it will be damaged. Note that it does not heat up much. It doesn't appear brighter than a new tube on a normal ballast. I'm just curious why the arc is moving like this? I have a video on youtube here:
any ideas?