Check out hlg lights. I dont see much people using the cobs anymore. From my research the samsung lm301b diodes are the best most efficient led available. The hlg 600 diy kit is 789. 620 watts with added 660nm red. Rated for up to 5x5 flower. It should rock a 4x4. And it looks like a retard could put it together. No soldering. Screw driver and wire snips is all thats required. Its my next light purchase. There is also the source it yourself builders on here who build bridgelux and solstrip lights that perform as well but require more effort. But, cost considerably less.nPeople on here are cool as hell though and are more then willing to guide you through the build. BTW…welcome to overgrow!