I picked up a 72" fixture off of ebay and have since replaced all 3 ballasts and all 3 lamps and it has made a huge difference in the brightness and color. The 250w MH's where more like 150w. You may want to look at spending a little more initially and then you won't have to upgrade down the road. I have also seen coralife units where the ballasts where upgraded and again, a huge difference in brightness.
Just my $0.02
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