How to tell if my LED light is too close?

You should be thru most the stretch hopefully.. I’ve grown some plants with a few buds literally 2-3 inches from similar LED light. It’s not prime conditions but they can handle getting pretty close. I don’t personally believe supercropping a few upper branches is gonna cause significant stress. It’s not optimal but sometimes ya gotta do it. I recommend this app all the time called “Photone” if you got bucks to spend.. it will help you for the rest of your time growing. It gives you a read PPFD read out that is very accurate. As long as your canopy isn’t pushing 1250 PPFD you’re in good shape. If they stay in that same range of 9-12 inches away from light you should be totally fine going forward! Good luck

I had the same problem with mine getting too tall and too close to the light, one of the first signs is the leafs closest to the light will start to yellow and start to turn brown on the ends and eventually will start to brown the whole leaf. what i did is start to do some LST on the top and other parts closer and easily start to bend them down over a couple days, while do that it also increased my yeild.

That looks like they are just where you want it. The led leaches out magnesium. So up that and increase airflow in the upper level of the canopy to decrease the light heat