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Originally Posted by SouthernSteven
They are under a 400w metal halide right now and I have a hps for flowering. I'm just afraid if I drop them too low I will burn them. No take backs once you burn them right? Should the distance be dictated by how much light they can absorb or is it the heat from the lamp itself?
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Definitely the heat.
Metal Halide tosses quite a bit more heat than an HPS. But with an HPS our 400 was about 14" above the tops.
Start at 20" and use the back of your hand at the plant top height to judge.