I'm using a 600w cob right now. Was between that and the one you got. Ill need another light soon, so please update how you're liking that light.
Hey yeh i was going to go with the meizhi 600 cob,not many reviews on that light but from what i can see,and the little reviews there is,its on the more red spectrum type of light,the mars ts and sp series have more of a wider range of spectrum blues greens reds etc...but personally for what it is as im a electrician its way over priced,the epistar leds are cool white,warm white with red ir thrown in,the light itself would of probably cost mars around just under 100 to make..but overall its going ok,awsome growth,it has a wider spread than the meizhi that is a pain in the ass because its not directing the light straight down more to the sides im going to do a comparison against my high output t5 setup...i will post a few pics of my plants in my grow journal in a few days...have a look if you want.