the 660 can run 4-48" bulbs but i dont think that you can mix vho and T5 on the ballist.i dont even think the 660 runs T5's,but maybe im wrong.i thought the 660 was a vho ballist.
The 660 can run either T5 or T12 lamps. I don't believe mixing the various diameter lamps on the same ballast is an issue but I would confirm this on the IceCap forum.
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