Led distance to leaf tip

I am growing a NL autoflower for first grow. Started off at 18 inches with Led lighting, now towards the middle of flowering and closer to 14 inch, what have others found to be the most effective and still be safe enough away.

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What LED are you using and how much does it pull from the wall? NOT what the manufacturer told you.

High end lights like QB’s or 'strips can be slammed down right on top of the plants during flower: 6 inches? But Amazon lights need to be much further away if for no other reason than to get a large enough footprint.

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