chasv77answered grow question 4 years ago FYI, I grew in a PC case, but only used 45W of LED bar lights. - - - - > Good harvest, considering. About 24 grams.
The input output fans, did keep the box cool, but I was able to utilize a lot of the vertical height, because those individual lights (<3w) burned cool. With COB, you may not get within a few inches from them, due to UV burn, thus diminishing your vertical capability.
This is just conjecture with your set up, good luck.