Several things Tead.
First of all the theoretical max efficiency is higher with these Samsung diodes than with Cree cxb3590s. I am running these boards at 75w each and getting a real world efficiency of 1.85 lumens/watt. I could run them softer and hit about 2 lumens/watt. To get to 1.85 lumens/watt you would have to run a lot of Cree cobs.
Secondly the build is a pretty light one compared to cobs. And the spread of the boards allow me to spread the fixture out and get very even light. And since the diodes are spread out I need no additional heatsink besides the Aluminum PCB that the diodes come on.
Thirdly I have always wanted even light to fill in the shadows on the plant. Cobs are way better than a single bulb like an HPS, and I have had success with my ps1000 and using a mover. But ideally I am looking for light coming from every direction. The best way to get that done is a board. These wide boards also help keep the light below the fixture by reflecting it back down.
There are no lenses available yet for these boards but once they arrive it will allow me to focus the light even more. That's when this tech will really shine. But even now the amount of light I am getting makes my CMH lights look dim.
Here are pics of my sour bubble I took today. Sunset day 50!!!! This strain is basically done but it keeps packing on trichs. I make a day to day decision on whether to chop!
Killer! She's ah frosty alright!