I have a strictly T5 tank, and the efficiency is usually MUCH better compared to VHO because of the smaller bulb size allowing more reflected light. I've heard people say good thing about supplementing their MH with T5 HO.
just keep in mind you need the proper reflectors, and proper cooling can almost double your output. there's a huge thread on it on rc.
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Everything I put in my tank is fully dependant on me.
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