Yellowing edges and brown tips in 7 week of flower.

Looks like late stage light and nute burn to me. Similar to your gorilla cookies grow diary results. Light intensity has cooked the upper leaves. They won't recover. If they get crispy and the plant matter falls into the humid buds below, the necrotic matter can cause bud rot. I'd remove the really sick ones. The main goal is to prevent the leaves from dying in the bud before harvest. Prevent it from affecting your sugar leaves. What happened is, because of the excess light, for a short while, they transpired rapidly, pulling excess water with nutrients and burned the fan leaves. Keep this intensity up and the same will happen to your sugar leaves and your bud quality will suffer greatly. This is not at all, necessarily because your nutrients were mixed too strong either. Necrosis is spreading in the damaged leaves because damage is done. As long as it's not spreading into the sugar leaves the problem is solved, with consequences tho. If it is spreading into the sugar leaves, reduce nutes, and raise lights. Get ur environment in check and let them finish with lower light..just might be the correct amount if your not measuring light.. I'm not sure why you lowered your lights, but when I lower or increase intensity it's for a reason.. Why would we move lights closer to a flourishing plant? Moving forward consider this, When we push the light intensity we're trying to get light deeper into the canopy. often, we need to increase the humidity to slow down the transpiration up top. This is an advanced grower technique as they recognize limiting factors and can often spot early signs of stress when growing strains they are familiar with.. The only reason to increase light intensity with a healthy flowering plant is to get good solid buds deep into the canopy. But there is a limit, and it ain't 2 feet donky d colas.. If running high end LED lighting , without CO2 and humidity control +++, trying to grow deep into the canopy a fools errand. Affordable high end LED lighting has a limited sweet spot about 6-8" of perfect usable light for the quality top shelf buds. Without a perfect dialed in environment, what we end up doing is burning the top trying to get more light to prevent lower larfy buds thinking we get more harvest weight. Simply explained, too much light up top chasing pot magazine 2 foot factory cola results is burning our your shelf buds. There are limiting factors to how much light different genetics can take as well, and It becomes an art to balance in your environment. Running different strains in the same tent can cause issues as well. One plant thrives where another's genetics is lacking or in .. Most often, less light is more, until everything is dialed.. like VPD. Advice, is trim off the dead and dying leaves. Raise lights and let it finish. learn about vpd, How to measure light intensity, Reduce light nearing the end of flowering. Happy growing,