420 I'm not exactly sure how long I'll veg for but when they get to 1' tall, that will be it. These seem to be bushing out, growing wider than tall and that's exactly what I was hoping for. Bobby, the plants are using the nutes. I don't know how much more robust a plant could get in this short of time. Last year I grew in soil and in rock wool but this blows them out of the water. You have to consider the strain also. I have a MH and HPS light; I'm not using them because I choose not to. I don't believe for a minute they would increase my plants size or vitality. I've got 5 nodes showing so far, two since Friday. HPS makes them stretch a lot more than these LEDs and that tells me one thing: the plants are getting more of what they need. Just because you blaze your plants with 1000w of "light" doesn't mean you're really doing what's best for the plant. Less than 10% of a HPS light is usable to the plant; that means that the rest of it is wasted. I've used 65w multi-spectrum CFL's, MH, HPS, and now LED's and T5's. From what I've seen so far, the system I'm using now is top shelf - and I'm not having to worry about heat and dangerous bulbs. A "friend" of mine on RIU almost burned his house down when his HPS bulb blew; it totally destroyed his grow op, about $8,000 worth of gear - and his plants.