Plant Lighting distance from plants?
Im growing tobacco under a metal halide/high pressure sodium switchable ballast light, I was just wondering how far a 400w light should be from the top of the plants, im thinking a 400w light should be 1 – 1 1/2 feet above , is that right? …Thanks
you want to keep the light at least 18 inches away from the top of your cannabis plants. 400′s are pretty cool to begin with. i use 1000w metal halides when flowering. these should be kept at least 24-30 inches away.
400w 20k metal halide w/ ballast, reflector and socket
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