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I havent used a 250 mh in a while but im pretty sure the smaller ballasts fire both 150 mh / 175 hps .250 mh/hps or something like that. Im not sure if it harms the ballast etc but im sure people were doing it before. I have a dual 4/600 watt but it is hps not mh/hps. I could use a hpit globe which is a mh conversion but theres not much use. There is 1000 watt dual mh/hps ballast are about an extra 50-80$ initially but worth the bucks. Hope that helps and for more info try ablite.com.au or sylvania.com stonedas

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