Check the 'Fulham' web site for wiring details on Workhorse ballasts. I'm using two Workhorse 8 ballasts to run four 48" T5HO lamps. The 8 is almost identical as the 7 in terms of wattage. Might be overkill, but by using two, I can run the pairs of lights on separate timers for more flexibility and they'll each run a little cooler running two lamps vice four. It's simply a matter of how many of the red wires you use to run each lamp. Cap the unused ones.
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