not good to have the same ratio of lights on your plants. example 3hps to 1 mh will do you wonders. so in your situation you have a 400 watt hps i would get a 125w flouresent light to put in there. lowes have them, self ballasted.
mobay Reviewed by mobay on . 400 MH and 400 HPS at the same time? Hey everyone, I've been lookin up on this and i can't find the exact answer for my situation. I'm growing in a small growbox in my crawl space, and i just purchased one 400 watt MH Sunsytem 5 econogrow and another 400 watt HPS Sunsystem 5. I got glass for both of them and i plan on ventilating the shit out of them so i can keep them as close as possible. I was thinking if i angled the lights towards eachother so the spectrums "criss cross", I could have both reach the plants and have an Rating: 5