Burning on Batteries?

Im thinking of running a 430 watt HPS light off of battery power that will be charged elsewhere to save on utility expenses. What sort of battery would be required to run such a light for 12hrs/day?

I figured 2 packs, 1 charges while other is used.

If battery power is not an option, what kind of electricity bill should I expect with a 430 watt HPS (12hrs/daily)

not possible on low budget anywayse think of 4 and a half 100 watt light bulb lamps running at the same times.

China youd need about 12 deep cycle batteries and a charger each battery about $130 and the charger then youd need a 500 watt converter about $250 or you could just pay the $20 a month for running the 430 watt bulb which will actually be a 400 watt ballast.