It doesn't work that way with most electronic ballasts. There is no heater power. The lamps are started without any pre-heat hence "instant start". There are some electronic ballasts that do pre-heat but they're less common.You can also check between the socket leads for the heater circuit volts. ( Hot Cathode ) Which will be low voltage.
Neither do LED power supplies. Yes, some electronic ballasts are more picky about line dips. Some will flicker, some not at all, and some actually reboots.Electronic ballast stink. They do not like line spikes. They will shut down and have to have the primary volts reset.
It's more to do with the construction of the electrodes. Most T8s do not use pre-heat and they start the same way as neon.Neon tubes are consider ( Cold Cathode ) no heaters. 15,000 volts transformers compared to say 1,000 volt ballast. Using high voltage to strike an arc.
Do it and it will act up and restart, fry, or lose calibration. Hey, its your tool, not mine, so do as you will.