Yes Craddyback, you have it right that the procyon is closer to a 250HPS, at least when it comes to our "photon whore" mj plant. I have also used LEDs on other plants, such as grape vines, and the difference is not as great.

I had used one of the original TI problooms I now have in a viticulture experiment and it pretty much equalled a 600w HPS, so much so I couldn't wait to use it on mj. I quickly did a "quick and dirty" grow in 2- 120 site EZ-clonners from start to finish (they say you can't grow to compeletion in a cloner, but hey the plants don't know that). Since they took up abt the same area as my previous grape cuttings I thought they'd do better then they actually did do. Difference in light needs of the plant is a major factor.
That was a long explanation to explain and give an excuse to some mfg claims about equivalent light comparisons.

So Crabby, maybe it's not a dumbass plant but it is a whore...for protons.:thumbsup: