Enough, yes.I have a 2.5 X 2.5 tent. Do you think the viparspectra xs1500 pro is enough for that space?
Optimal - only for the 4 sq ft in the center. Once you go past that, you (probably) won't have enough light to get to 800-1000µmol but, if you actually use the light to its fullest potential, you'll get a really good crop.