I have bought every single model that King makes. I can tell you that they are cheap for a reason. They burn out after about 6 months. It's basically like throwing money away if you are a hobby grower. Poor customer service as well, since these dudes are located in Shenzhen, China. The Epistar LEDs will definitely grow some good bud, but it's far from optimal. For the 2000 model, the ideal flowering size is almost exactly 2x4 at 12 inches height to achieve a decent PPFD of about 1058. That's just at the top of the canopy though, and quickly diminishes just a few inches deeper. It is as hot as hell too, and will quickly put your tent in the upper 80s without proper exhaust.
Even though I am quite negative about the light, it's one of the better options for a budget...which we all have, of course. It's simply the fact that these blow up waaaaay too quickly and it is nearly impossible to get good service as the company expects you to fix the light with parts they send.
With this one, I've gotten 17 0unces with 4 manifolded plants consistently. Again...plan to replace it often.