said by kruser:
I agree with that fully. Not sure what happens if you plug a standard T12 or T8 tube into a socket that has been re-wired for direct 120 volt line voltage!
If the LED tube is fed with 120 volts at one end and the other is simply a mechanical attachment plugging a florescent tube puts 120v across the filament. That would probably be prettying exciting.
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Florescent tubes work by ionizing mercury. Once the filament burned out I assume line voltage would be able to maintain an arc, since we are only talking about a half inch between filament supports. With nothing limiting current (assuming socket is directly wired to mains) the end will get very hot very quickly and probably shatter. All this will probably occur at current and time-frames that will not trip circuit over-current protection. But that is just a guess.
Someone up for an experiment?