The way I learned is you want 50 watts per sq.ft,especially to flower with.For example an 8 by 8 room approx 64 sq ft would require 3K in HID lighting(perfect for 60 sq ft actually).I guess its beneficial to know both formulas
ballastman Reviewed by ballastman on . help me is a 200 watt heat lamp enough to make my babies grow?:smokin: Rating: 5