I have utilized both a Pro Grow 180 and a 260 in a 2x2 tent. And both worked very well. I like their product. Right now I am trying out a Calif Lightworks SolarFlare 200 blooming version for an autoflower. After a slow couple of weeks, "Moby Dick" has been growing very well. Canopy for this grow is 20". After a few more grows, I might try the Pro Grow X5-200.