Correction / clarification to my previous post:
1) Old-fashioned fluorescent lights that use replaceable starters do have an electric arc within the starter module (but not within the bulb itself). I wasn’t aware of this, and just saw it when checking to make sure my facts were correct.
2) The flow of electricity from one end of the bulb to the other is considered an arc. However, this arc doesn’t involve the heat and/or sparking that (AFAIK) cause the halachic equivalent of aish.