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    MH to HPS conversion bulb

    So I'm just starting to grow and I already have a 250w MH ballast and reflector. Right now I'm only growing two plants at a time. Right now I'm using cfl's 230w total, what I would like to do on my next grow is to use the mh for veg and hps for flowering, but I don't want to buy a new ballast...
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