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I'm confused -- you started talking about a hps ballast then asked about using a MH ballast. Are you talking about two different ballasts?
Regardless, you should not use a MH bulb off a HPS ballast unless it is a MH conversion bulb. And you need to match wattages, don't try to use a 400w bulb in a 1000w ballast. Don't know why it would say "up to" 1000w, but it isn't made for varying wattage from 400 up to 1000.
__________________ toastybiz |