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wait, what do you currently have? if you have a 1000w Hps ballast that has a socket and everything you need a 1000w HPS Bulb, NOT a medal halide bulb. If you want to use medal halide bulbs with an hps ballast you need a conversion bulb. Medal halide is better for vegetative growth and HPS is best for flowering although you can use both kinda of bulbs the whole way with good results.
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