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The Best LED Grow Light for Marijuan is: kessil 350 magenta led. It is a Cheap LED, even thought LED's Grow Lights are expensive
Best LED Grow light 2013 is still kessil 350 magenta led
I stopped using my 600 HPS over 1 year ago and switched over to Kessil 350 Magenta LED grow lights. When you stop using HPS and MH lights, there is a learning curve. So if you're a commercial operation that cannot afford any temporary reduction in harvest yeild, then you may not wantt o switch to LED lighting. But if you have the time, and a bit of money, it can be a successful change that you will never regret, because your harvest yield will increase using LED's, your fire risk will be greatly reduced, and the flavour of your buds will be better because you won't burn your plants any longer. You'll also save a bundle on ventilation costs/air conditioning costs, because LED grow light run much cooler.
If you live in sub-tropical or tropical climates, and you need to reduce heat indoors, then you don't have much of a choice. LED growlights, are you're only choice. By reducubg heat, you can also increase your yield, and your female/male ratio, because excess heat can cause stress, and stress creates more male plants. For an excellent article to increase your female : male ratio's, click here.
Keep in mind, with your lower room temperatures, you will water less, so your nutz will be completely different. Nutrient guides for HPS/MH are not the same for L.E.D. Before you had to keep your water cooler than in an HPS/MH setup because of the increase in ambient temperature. A secret tip is to pump it in from an adjacent room which is 12 degrees cooler then my grow room.