yes they do werk i am using a 250w hps ballast i my mh bulb in for veg and switched to my hps dur flower no prob but you cant do the other way around mh o hps i think

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half the lies i tell are not true unlike every thing in my imagination and random pics i may post check out my pics of star till now
http://www.rollitup.org/members/chknhwk-64283/albums/test-grow-bag-seed-1327/