well, not to be controversial, but 5x5 is only 40w per sq.ft. Sure you can grow under this, and I am sure it would be fine, but is not the intent to make DANK!! Super dense nugs require more concentrated lighting power. I know that the suggest footprint for this light is probably 5x5 or maybe even larger...but I am leaning towards 4x4. This would give you 62.5w per sq ft. and I think would give you a better, denser end product. I personally like to stay above 75w per sq.ft as a rule of thumb....but then again, I think I am going to be known for doing things a bit over the top...so, take anything I say with a grain of salt....lol.
dank.Frank