Umm- that 50w per sq. ft. rule refers to 50w of HPS, based on the output per watt of a standard 1000w hps in a magnetic ballast.




Remember, wattage per square foot is a metric of power consumption, not brightness.
rhizome Reviewed by rhizome on . What's the optimal watt count per square foot? My homegrown box puts out a total watt output of 107W/ft.² from 3x125W CFL. This is a CFL grow. I want to know if this is overkill since I've mylared every surface inside the box so that should increase efficiency as well as penetration. I know it should be 50W/ft.² so please tell me if 107W/ft.² is too much because even if I removed one light I'd still get a total output of 71.43W/ft.². Any advice from seasoned farmers would be nice of course. Rating: 5