A Grower’s Guide to Cannabis Lighting Requirements
Cannabis plants require specific light intensity measured in PPFD, ranging from 100–300 µmol/m²/s for seedlings up to significantly higher levels for the flowering stage. Blue light (400–500 nm) drives structural development during the vegetative phase, while red light (620–750 nm) is essential for maximizing bud density and resin production during the 12/12 flowering cycle.
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