I recommend finding out how many lumens it produces, assume 10,000 lumens per square yd to achieve proper lux and have maximum growth.Thanks for your reply!
I know that coffee is acidic, I took used coffee grounds and washed them with water, then dryed them overnight. Since coffee is acidic I added dolomite to my soil, to lower the acidity and help plants to absorb nutrients from the coffee.
At the moment i'm using 60W full spectrum led light