Quote Originally Posted by sheist
lumens are the measure of light according to the human eye.. not the plant, so you can't go based on that..
More lumens = more light for the plant. Period. LEDs produce less light, and more heat, than any other source of light short of incandescent. They are WORTHLESS for growing compared to HID and fluorescents. You get more heat and less light. That is not how you grow good marijuana. Light penetration is worse than fluorescent.

And they cost way, WAY more than a really nice digital HID system...