Are you talking about the 357 mag or the 357 mag plus?
While 56w/sqft should be really good I'm more concerned about the 32" depth than the 54" width so you might end up with weaker corners due to the magnums (on the ends) not being strong enough to cover the 32" part. Where there is overlap from the SS400w you should have good growth. Remember, the SS400w also uses 5w diodes to it'll penetrate better than the other lights too so you'll still want to keep your plants short.
Hope that helps...
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