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i've read a grow guide that said 3000 lumens per plant was perfect but ive also read guides the said 100 watts per plant, but growing under the sun, which is 10,000 lumens per square foot grows a plant thats strong but not as potent. so i believe four plants grown under what you have will yield...

50 watts of L.E.D. provides enough lumens to grow two plants perfectly. With environmental safety being the deciding factor. It's a tiny bit more effecient than cfl but more expensive.