well it’s kinda debatable cobs have intensity but the thinking is with more individual sources of light there’s more angles and chances of light making it thru the branches with the PCBs, but cobs or boards if the canopy is too dense it’s not really making it thru anyways.
it’s too bad youtube has been a piece of shit lately but LEDgardener and growmou5 are two great sources of information if their videos are still available, i think the former doesn’t do cannabis videos so should still be up no problem. you can find PAR results and efficiency numbers etc.