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The ballast doesn't change ac to dc but regulates the amount of juice going through. A regular lightbulb can take the full standard household wattage and amperage and use what it needs without the rest affecting it. HID and fluoro lighting, on the other hand, need a strong pulse at the start to get going and then need a lower trickle to keep going, that's what the ballast does. So yes, it maintains a steady flow but after it gives it that needed initial pulse.
I am nervous for you about running a 400w bulb on a 1000w ballast. From what I know, yes, the bulb should explode or at least fry its guts out.
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