I was going to go with metal halide's orginally because of basically how effective they are. But then I realized to put that wattage over a tank of 265 gallons, would be like 40 bucks a month in just the lighting bill.
With all the hype of T5HO, I was wondering if they were interchangable (obviously by matching spectrums and lumens) and I could get away with using less wattage.
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