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A light deprivation room can fail for one simple reason: the ventilation works against the blackout strategy. That is exactly where Dandy Cannabis Light Deprivation Max-Flow Light Traps matter. If your exhaust and intake system moves enough air but allows light contamination, you risk crop stress, flowering disruption, and uneven canopy performance. If it blocks light well but restricts airflow, you create heat load, humidity spikes, and static pressure problems that hurt the entire grow. For co …