Since you asked, I will tell you 11 is way too many for what you have going on in the future.

Right now, its fine.

However as they grow, space might become the issue.

I think 400W is fine for the square footage you have....

How large do you intend to let the clones become?
HARDDON Reviewed by HARDDON on . @1st day pics! Well today started the 21st day of growth for my 11 clones all but 2 seem to be doing well with 2 lagging behind. Does anyone think 11 are to much with this space and a 400w MH/Hpa swithable ballast. Rating: 5