Ballasts invaribly use more wattage than their rating. Electronic ballasts are just a little closer to the true rating than those magnetic and wire loop style ballasts. Hence, the reason they say you save energy when using e-ballasts.
What the ballast draws and what the bulbs draw are different numbers. I'm not up on all the particulars, though. I would say that if you are using a 660, then you are drawing 660 watts, no matter how many bulbs are connected.
HTH



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