I agree. I just replaced three commercial grocery store florescent ballasts. I replaced each hot because that is how I roll. With no bulbs in the fixture, there was still a small spark when I connected the power leads. It drains power just like your cell phone charger even if the cell phone is not attached. If ballasts work like stereo amps, not having speakers connected causes them to heat up and burn out since there is no load and the power has to be dissipated by the amp...or in this case the ballast.