I would throw that fixture in the trash. For one reason. Last saturday I was bagging a fish for a lady and all of a sudden that same fixture but with 3-250 watt MH;s caught fire. I asked the owner if it was just an old fixture he stated that this wasnt the first time with that manufacters lighting fixtures. I will get more info on them for you.
Its from Current USA. Not from some Chinese mock up, a certain Chinese mock up looks just like Current USA but is really cheap. I paid $200 for this USED. It would have been $500 NEW. I'm getting a MH to replace it anyways. I am sick of the bulbs breaking, it costs me $160 per month to replace those bulbs. I will pm you a link that includes the new MH light I am looking at.