all i can say is i was worried at first but a good friend told me to trust him as he has gne totally led already. so i said ok and bout a 630-660/460 panel off ebay. around 160$. so i did notice a ton of difference in the way the plant was growing under it compared to the rest of the clones under 450hps. a whole bunch of leaf growing and no stretch at all. a few weeks in i was concerned of the way the led plant looked BUD wise compared to the others under hps. my guy told me "ignore it for now. and one day during the grow ull say to yourself hmmm i judged it too soon" well ill tell u since i started flushing this plant (a bit earlier then i usually do, also advice of the guy who talked me into led use) the buds have blown up like crazy. i can tell u 100% that im going to get about the same off this one plant under said 90 watt ufo. then i did per plant under the 450 hps. and im positive it could do more then 1 plant as well. since a friend of mine uses the same panels x3 over 10 plants in a 4x8x8 closet. and hes pulling around a half p per. which is roughly the same as our ovg on this strain under the hps lighting (600watts)