This. Exactly this.I have seen 120v bulbs subjected to 220 on several occasions. They normally come on super bright and burn out in less than 10 seconds very much like a flash bulb. The bulb is designed inside very much like a high voltage standoff and the path to reinitiate the arc would take much more potential than the 220 applied so in that regard it should be self-extinguishing.
That still doesnt mean I would want to be hanging onto one when it happened. When things flash and pop people react and those reactions are not thought thru or planned. The last thing you want when working with potentially deadly things is to be having involuntary reactions.
The odd of it exploding in the classic mode of explosion is really quite low I would expect.
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