How far to keep HPS light from plants

This is after I moved it up I set mine about 6" above tops and move when top leaf lip corners have crispy ends. Mine also stays cool enough to touch right at bulb I've bleached the top of 1 bud with this method but makes sure a

vostok said:

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I wonder if the numbers for metal halide are similar

GroDank101 said:

I wonder if the numbers for metal halide are similar

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I rarely use my 400w Mh these days as I was shocked to see how small the Lu

over say my T5's even cfl?

cheers/

I like to hang a thread with little tiny nut hang from the bulb at 8 inches to score that 65K Lu on my 600w

lol

check this just in https://www.rollitup.org/t/the-role-of-lighting-in-cannabis-cultivation.986117/

cheerz/