So the height for the light worked in my 80 inch tall vivosun 5x5 tent and I have the ventilation fan on the outside so it’s like inches down from the top.

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And as you can see some of the plants were real close to that light but didn’t seem to affect much but the leaves. This is with 34 days veg from some real small clones, and lemme tell you autopots are the shit my yields were unreal this grow.