500w Outer Orbit HQI vs. 216Watt T5's in a 33 Gallon Long Setup- Which one???????????

That's going to be a wicked tank when it's all said and done. Sticking with the T5's is a good idea. The only thing I would look into if I were you is replacing the Catalina reflectors with Ice-Cap reflectors. They may not fit, but if they do, you will get noticeably more light directed into the tank.
 
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