02-02-2012, 07:28 PM
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I agree with Quantum, with one technical exception. I believe that T5 fixtures will run any T5 tube, be it NO or HO? So unless I'm mistaken in this, NO tubes would reduce your intensity. But finding NO tubes is not easy in my experience, though perhaps where you live it is different.
Aside from the above, reducing the intensity would mean a new fixture, either a single T5 tube or a T8 dual or single. Mention isn't made of plant species and other data, so I can't at this point recommend one over the other. But I will say that a single T8 tube over my 29g provides sufficient light for all but the fussiest of plants.
A further option is floating plants. They do a terrific job of reducing light intensity. And under any of the above scenario, I strongly recommend floating plants. Their "side effects" with respect to water conditions is a real bonus too.