its all confusing... supposely a 315 is equal or exceeds a 400mh- so in my case (4x3.5ft tent), i'd be real close to a 1000watter
now i have grown with 1000wattter's , not in a tent but a small room , and the buds with the big-dog are bigger, and it seems more resin, and the penetration is def better...
if u should have a min of X watts... per sq ft, and a 315 is more powerful then a 400.... well i'm confused....
315 cmh have a better spectrum than a 400hps but lacking deep penetration of the hps ,so 3x315cmh will have better penetration (more light point /less hot spot)also better spectrum and will give you arm length bud than a 1000hps.
Also and old 1k hps user and 2x315cmh are not as good for a 4'x4', but 3 cmh are way better than a 1k hps
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