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- 18/6 or 20/4: standard vegetative growth cycle for most crops
- 12/12: triggers flowering in short-day plants (cannabis, some chrysanthemums)
- 16/8: common for most herbs, lettuce, and leafy greens â extends harvest window
- 24/0 (continuous light): used for some seedlings and microgreens; causes stress in some species
- Use a timer for consistency â irregular light cycles stress plants and can disrupt flowering
- Day-neutral crops (lettuce, most herbs) produce continuously regardless of light cycle length