These are extremely overpriced. I see this on ebay for $400 and up. This is insane since they're essentially really just standard Chinese plurple lights. For $400+/- you could do much, MUCH better, like something based on Cree, Vero, CLU etc. COB lights. Trust me, not saying you couldn't grow with this "1200W" light, but at some point you will want something real, not some plurple lights from China
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Chances are, 1 year later a whole bunch of the LEDs will have been burnt out, I wouldn't know why these should be different than my old MarsHydro (which I had before I switched to CREE COB). All using the same crappy Epistar etc. LEDs
Also.."LED lights reviews" sites not just for the Viparlights, but in general...make me puke up in my mouth. Pretty much all these sites that come up in google are just Amazon affiliate sites, and it's clear the "reviews" are all just bullshit. Any site who does serious reviews will list COB based (CREE, Vero, Citizen, Luminus) etc. based fixtures, Quantum boards or whatever good stuff there is out, and doesn't recommend Galaxyhdro, Viper, Marshydro, Craphydro etc. lights from China.