Hey check this thread out http://www.rollitup.org/grow-room-design-setup/205689-315w-cfl-150-hps.html I suppose we will see the difference by summer, one of the seeds in a 6" pot just popped the surface a little bit ago. I figure if veg it till end of next week then start flowering it will be at least close to comparable, though definitely lower yielding than your two.