I assume you already have both? If you're buying new I wouldn't do either as neither of them are true spec T5HO ballasts. A workhorse underdrives the bulbs and an icecap 660 overdrives them. Neither is optimal. If I had to choose between the two I would probably opt for the Icecap if you have the ability to actively cool them, otherwise I'd use the workhorde.
If you're buying new get an advance ballast.
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Steve - Retired from reefing, for now.
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