I haven't heard a whole lot about those king lights personally but have seen them in a few grows. Hard to say if they really stand up to some of the better brands or if they are quality built. I know some cheaper ones crap out a lot which is why I was leery on buying the one I have but so far no issues at all. Sometimes you get what you pay for right, but other times it may just be that good of a deal. I wouldn't mind trying out a decent cob light setup if I could get them cheap enough to build a couple rails myself for them. Put 4 or 5 of the 200W cobs in a rail about a foot apart or so and make 2 rails I seen a similar setup in a journal so I can't take any credit but that's the short of it lol