For what its worth, I keep SPS under a 150W aqualight no problem... even at the bottom of my tank. In fact, things grow light stupid in my tank with that light (the actinics put out a whack of light too... that's an additional 196w). To my knowledge there are no ballast upgrades for the aqualight but I could be wrong on that fact.
How big of a tank you got there?
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