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Doob, is that a MH conversion bulb? HPS requires an igniter which is built into the ballast (that's really the only difference between MH and HPS ballasts), and a MH bulb does not. And regardless wattages are supposed to match. What you are describing flies in the face of everything I've ever heard about how MH and HPS work. If it works for you, great, but I don't understand how.
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