Similar to a cob just spread out leds vs compact and printed. The “quantum board” requires a heatsink but does not require paste as a thermal bridge. I think I would still use it as it probably cost .50 cents to cover the area. I have a build using Samsung led strips that I tested with an IR temp gun and there was a difference in temps.
There are cheaper versions popping up with epistar and osram leds but the ones you would want use the Samsung pcba. Printed circuit board assembly.