Lights Too Close in Flower Cannabis
Lights Too Close in Flower Cannabis usually means the tops are taking more light and heat than they can dissipate in late bloom. Watch for bleaching, tacoing, foxtailing, or crispy upper sugar leaves, then compare fixture distance, PPFD, leaf-surface temperature, and canopy evenness before blaming the feed chart.
Lights too close in flower cannabis? Learn how to confirm top-canopy light stress, bleaching, foxtailing, and the next checks to make.
Common Causes
- The fixture is delivering too much PPFD to the top flowers
- Leaf-surface temperature is climbing because light and heat are stacking together
- Uneven canopy height leaves a few tops far closer to the fixture than the rest
- High VPD or weak airflow makes the upper flowers less able to shed stress
How to Tell Which One You Have
Lights Too Close in Flower Cannabis is easiest to confirm when the damage is strongest on the highest tops directly under the fixture, while lower flowers stay greener. Bleaching, foxtails, or curled upper leaves are stronger clues than generalized fade across the whole plant.
FAQ
How do I tell light stress from a late-flower deficiency?
Light stress usually hits the highest tops first and follows fixture position. A feed issue is more likely to spread through the plant in a broader, less height-dependent pattern.
What should I inspect first?
Inspect the top colas for bleaching or foxtails, measure fixture distance and PPFD, check leaf-surface temperature, and see whether only the highest flowers are affected.
Should I lower feed right away?
Fix the light pressure first. If the tops calm down after raising or dimming the fixture, the nutrient plan was probably not the primary trigger.