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Depends on if you are referring to the xr15 or xr30 and what your plans are for corals and coral placement.
If it were my tank, I'd probably start with 4 units, but I'd add in some retrofit 60" T5 bulbs (2 bulbs in front and 2 bulbs in back). You might still want to add in a 5th unit depending on what you want to keep on the bottom part of the tank. If you're opposed to using T5s, I think you still would be fine with 5 units. Evaluate your tank as the corals grow out and add in an extra unit later if you want more coverage.XR30's for a SPS tank.

