i do not believe in LED lights for growing sick, dank bud! Plants need more then one or 2 accute spectrums of light for ultimate terpiniod, and canabinoidal production. LED's, or light emitting diodes only produce one spectrum of light. Sure, 650nm has a very high photosynthetic response, but the plant is also responsive to lots of other light spectrums, the photosynthetic response range is believed to be between 350nm and 700nm, and the fact is, an hps light produces a much, much more wide spectrum, with a slight focus on the five to six hundred nanometre spectrum, meaning a more wide spread photosynthetic response. Sure, the LED will grow a plant, but the HPS will grow a much better, stronger, and potent plant. LED's used in unison with another source of light works much better, and for reasons stated above.