L.E.D's work good from start to finish as long as you buy the right ones. You want the L.E.D's that offer a 460nm in blue and a 640nm in red. I would do your homework and not automatically take advice from people who have most likely never tested them out themselves. I've grown with CFL,HID,& L.E.D's and can tell you as long as you buy L.E.D's that offer at least 1watt per L.E.D and follow the NM wave lengths I stated above you'll out grow HID watt for watt. Their are a lot of sellers who state that a 90W LED will out grow a 400W HPS,I wouldn't agree with that but if you take 90 watts of L.E.D and do a grow test against a 150Watt HPS the HPS will be lost in the UFO's dust. If your growing medical for the price I would just use a 400watt cool tube with a inline hooked to it,otherwise the L.E.D is well worth the money with it giving off NO IR! That alone for a non medical grower is well worth the price. Also for 6-8 plants you'll need at least 2 90w UFO's or 1 of the 300W rigs. I know a guy out in Cali using 2 300Watt L.E.D's in a 6x6x6'5" grow tent and he got 540grams of it. If you have grow skills they work great!