I’m trying to fit my marijuana garden into a space of 5’ x 4’ x 7’ (a total of 20 square foot). I want to use at least 40 watts per square foot (psf). Do you have any suggestion on what I should use?
You could use a 1,000-watt lamp, which would produce 50 watts per square foot (psf). You could also use two or three 400-watt lamps, which would ultimately produce 800 or 1,200 watts—exactly 40 or 60 watts psf.