I'm running 2x21W and 2x39W T5s off a WH7 (the NO tubes are because I can't get at HO blues for a price I won't balk at). I upgraded the NO whites to HO a couple weeks ago and swapped one at a time to see if it's actually driving bulbs correctly... WOW! It sure worked, and these suckers are bright. With parabolic reflectors I'd say the T5s rival VHOs easily. I was seeing stars for minutes after I put everything back in place and walked away.
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