what do you mean grow off with me? one i am not trying to do a grow off, i just want to grow and if you want to match my yield to urs then fine, but i am not trying to go heads up because that dumb, the whole envirment if different, different growers, different nutes, different soil, different strains, different temps. their is no way to keep this 100% fair. plus i just want to grow i dont care about all this crazy stuff, all i know is his his light works for me and suites my needs compared to a 600w hps then i will continue to grow with it. if it dosent then it will be out of my room and i will fire up the hps from then on, untill i see several grows that all are getting great results from many different growers using the same leds.