I noticed some darkening on the ends of pistil's, I'm guessing light burn??
Since they started the stretch daily, they were close to the light..
Any ideas??
Pistils come in, in waves. The first set comes in then starts to darken, then new pistils will appear and darken. When the tips of the pistils brown it is due to light/heat stress. You can see how the serations on the fan leaves are curling up, and how 3d the leaves look, this is due to light and or heat stress. Make sure your temps are good and back the light off a bit. Happy growing.
My temps are great, I'm using LED lighting, this happened in the course of one day, I have raised the lights higher above the canopy, but I am running out of room, 63" tent..
There's no question this is from light burn you can tell because the pistils have turned pale white or looked bleached. Hopefully, I answered your question and remember Happy Growing and Free your mind one puff at a time.