I have tried to not see this because I didn’t notice it 40 years ago, at all. I was training my WW autos and a leaf a had tucked over another leaf and covered its stem. The exposed leaf stem was tinted reddish almost purple along its entire length as well as the stem it attaches to. The leaf covered up was clear green and its stem was green except where a small portion near the bottom was exposed to the grow lights. It angled across the stem, one side bright green, the other a deep crimson color.
So I look allover and focusing closer to areas like I had just seen…its everywhere. Like a shadow of crimson wherever a part of stems and even leaves are exposed and covering up other sections.
I’ve went back and noticed it’s mainly isolated to the stems of the leaves and on the main stems. Im 12 inches over the main tops which are trained tight as I dare.
My LED lights are not powerful enough to burn that close I would guess. Two 600w Mars Hydros non-dimmable full spectrums running 14/8. I dont think this is a light problem or nutrients. There’s no sign of stress from any bugs (I have fungus gnats but who doesn’t) or diseases.
Has anyone else ever noticed this before? This is what I’m seeing