Hello, I was recently pulsing a coil at fairly high voltages (200-600VDC) using DC squarewave, at fairly high frequencies (100Hz - 1.3KHz). The output of the coil had a Neon bulb attached. I wasn't measuring current output at the time. At one point, i don't remember the frequency or voltage, the Neon bulb glowed a brilliant white, with a purplish edging. This lasted a few tens of seconds then the bulb blew. Until this point, as far as i knew, the emission spectrum for Neon included only orange/red/green and purple at 450nm. Can anyone explain this ? Thankyou, DC.