I flower 18 at once. 9'widex5'deepx8' high (give a couple inches it like 9'6 but thats where the filters and pumps are)
140,000 lumens per 1000 X 2= 280,000 lumens
divided by 45 sqft is over 6222 lumens per sqft if my maths correct.
I go three deep x 9 under each light pushing the...