Just had a quick question regarding my lights. I just purchases two 600 w HPS for about twenty plants covering a 3x6 tray. Is my light going to be efficient enough?
depends on how big, but 18 plants would be better for that space that's a square foot for each plant.....also looks like he says tray not growing space....
The rule of thumb is to have at least 50 watts per square feet. You have 18 square feet under 1200 watts. That comes out to 66.66 watts per square feet. Yer gonna be fine.