ok the gen rule is 2500 lumens per sq ft to grow with in any grow room. ok so if thats a fact then why not take a 4' 8 bulb t-5( 3000k red bulb's for flowering) that puts out 5,000 lumes per bulb totaling 40,000 lumens (8x5000=40,000) witch will cover a 4x4 area ( 40,000 lumes / 16 sq ft = 2500...