TreeFarmerCharlie
Well-Known Member
From THIS LINK:
How to Recognize Light Burn On Your Plants
Because LED lights give off so little heat, you don’t run much risk of causing heat damage by placing your fixture too close to the canopy. What you do risk is light burn. Unfortunately, the light burn is easily mistaken for nitrogen deficiency, and many growers wind up misdiagnosing their grow and addressing the wrong problem.
If your plants have light damage, you’ll see symptoms such as:
How to Recognize Light Burn On Your Plants
Because LED lights give off so little heat, you don’t run much risk of causing heat damage by placing your fixture too close to the canopy. What you do risk is light burn. Unfortunately, the light burn is easily mistaken for nitrogen deficiency, and many growers wind up misdiagnosing their grow and addressing the wrong problem.
If your plants have light damage, you’ll see symptoms such as:
- Leaves point upwards.
- Bleaching, which takes the form of white or yellow discoloration, typically on the leaves closest to the light.
- Veins remain green even as the rest of the leaves turn yellow.
- A plant with a nitrogen deficiency also develops yellow patches, but the damage starts from the bottom of the plant and works its way up, while light burn begins at the top, closest to the lights.
- In the case of a nitrogen deficiency, leaves wilt. In the case of a light burn, leaves turn upward and sometimes even become brittle.
- The leaves of a nitrogen deficient plant fall off on their own. This does not happen to plants suffering from a light burn.