I’ve gotten something similar growing under cob led lights in low humidity. I doubt that’s the only thing that can cause those symptoms, but I’m pretty sure that’s the only time I’ve experienced it personally. I’ve tried several different grow styles and nute regimens, and humidity always seemed to be the one consistent factor for me. Seems like powerful LEDs run close to the canopy can drive the plants harder than their capacity to transpire, perhaps. Every time I’ve gotten close to ideal VPD numbers, the plants looked almost perfect.
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