Metal halide bulb

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Hi,
There are many type of metal holide bulb in the store for example 150 W or 200 W or 400 W. I have a question:
What is the voltage of that bulb? 220 or
110

Thank you
Kevin

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    I just installed one today, that was 120 volts. But it’s the ballast that can have a very different line voltage. ie. 120, 220, 244 or 277. These lights can also take some time to light up.