I was just looking at the output models for them, at 24" they will put out a 30x30 area with 160 to 239 PAR running at 100%they are more suted to a 24x24 area which would still be a tiny bit less than your 400's (mind you I haven't seen the new tank.) at a distance of 30" they only put out a 24" area at the 160 to 239 PAR.
so lifting these lights to get away with less wont work. they do look like a nice light though...
Steve
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