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Full spectrum 2000W LED at about 18" above plant top, light meter reading about 35K lux. Aha! Surprised myself with that reading -- too much light?

My 4-week-old autoflower seedling starts the day looking normal when I turn on the light. During the course of the day, the newest leaves in the center gradually become more erect, ending the day nearly vertical. Sometime late in the evening, the older fan leaves begin to droop as if needing...