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I just got a north star lighting HID ballast that also came with two 250w mercury bulbs. On the side it says its 460w, 277v, 1.9amps, and M/H. I think that its a 400w Metal halide lamp, which would only be good for vegging right? I would like to test to see if it works, can i do it with the...

I just bought a new HID ballast that says 460w on it. What size bulb should i get? Thanks ahead.