how many volts an HQI lamp need?

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Hi,
i don't have any HQI set yet but i'd like to know before buy.. for what i understand an HQI lamp needs something like a 'start' signal to work.. well i'd like to know how many volts are required to make this thing work?
I'm asking this because one friend told me that to power up a UHP lamp i would need a 365v DC stabilized power supply so i'd like to know how is with an HQI lamp because 365 seems so many volts for me :xeye:
Thanks
 
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