Lol, sorry I didn't get here sooner. Now my experience may have been different than most but take the time to read through that thread first.
Something I notice happening here is people that know little about lights come here for advice and DIY seems to be the only answer. The same thoughts ran through my head, why would I do DIY or buy some ugly ass premade panel when kind has been around for years, specs, claims, fancy adds and my favorite remote controlled. The difference as stated in the kind k5 experience thread is kind runs at 22.5% efficiency. 149 par watts from 678 wall watts.
Most of these cob lights are 50-55-% efficient. So for 300 wall watts you can have the same par as kind. Plants don't care about claims, fancy paint, or a remote.
I finally got my shit together and picked up 3 Amare se-450's. Growth is amazing, heat, and energy used is cut in half. No issues at all and even get emails from the owner asking about my progress. With kind I had to fight for 2 months to get some of my money back.
It's your money, u can burn it or use it on lights that work.