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A light bulb is manufactured to operate on a specific voltage. The voltage can be a low as needed and the manufacturer will compute the size of the filament that is needed for a specific wattage. If you are referring to a threshold voltage then that is another question that needs to be asked.

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Q: WHAT IS THE LOWEST VOLTAGE NEED TO LIGHT A LIGHT BULB?
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Related questions

How many volts does a fluorescent light bulb need?

The correct voltage should be printed on the light bulb.


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Need more information. Wattage of bulb, voltage of bulb, voltage of battery and wire size of the circuit.


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Yes, even a potato can light a light bulb. Yes. If the batteries match the voltage of the bulb, they can light it. Flashlights have bulbs and batteries that power them. If you mean a household light bulb, then you'd need many batteries in series (80 of the 1.5 volt batteries).


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