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I think they make a 1000wt dual-spectrum ballast - 600w HPS and 400w MH running at the same time (or individually). you need the Sun Spectrum reflector though (you can get it with air-cooled fittings and glass cover.
just a though. you will need a way to keep things cooled down - make sure to air-cool the light and exhaust the room with a fan.
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