Photoperiod Light Leaks Cause Problems
Tiny amounts of light during the dark period will revert or stress a flowering plant. Power LEDs on a fan controller, a gap in a tent zip, a phone screen during a check, all of it adds up over eight weeks. Stress tolerance is mentioned for some lines on https://budweedseeds.com, though no genetics fully survive a serious leak. Sealing the room properly costs an evening and prevents a season of confusion.