What is the lowest voltage required in order for Helium to become ionized? Is that equal the ionization energy in electron volt per mole (kJ/mole)? If so it's only about 24 eV for Helium. Typical voltages are around a few thousand volts for most commercial plasma globes, sometimes around 10,000 volts for some homebrew ones. But ionization potential is typically 50 to 150 volts. So does this mean that the plasma is created at very low voltages but in the case for plasma globes are very high voltages?