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I use a 395w 3w
www.growledhydro.com Spectra LED unit, it has 252 3w LEDs which with their power and the 6 fans adds up to 395w. I'm saying whatever you get with these LEDs, just know its far from the best LED has to offer (and isn't going to compare to HID watt for watt like the better LEDs). I would suggest buying the 240w Blackstar units if you are strapped for cash (but remember they really run on about 133w) its the best you can get without paying almost $3 upfront for each w it really uses (not by that sum of the max rating of the LEDs). If you want a unit that is built to be the best and to last the longest (also has best warranty and return policy) and you have the money to spend then go buy growledhydro Spectra lights (rememebr though, when they talk about the wattage of their lights, thats the actual total (it is not the number of leds x the max w rating)
here are some pics of mine and some of what I've done with it. I only had it long enough to flower those plants the last 8 of their 9 weeks of 12/12. This baby ain't tri-band, its 12. Designed (although with LEDs thats more like paying for the best features and best parts most companies won't) and tested by cannabis growers in Cali. I read at least 7 completed grows with lights from this company, all great stuff, everybody switched from HID or whatever LEDs they were using to GLH (except during the winter when LEDs run too cool for some). I could go on about those features, but I will shut up now unless you want me to talk more
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