Light burn on cannabis leaves
What it looks like
Tops closest to the lamp bleach white or pale yellow. Lower growth stays normal. The damage stays on the leaves that see the light, not on the shaded ones.
What usually causes it
Raise the lamp or dim it. Bleached tops do not green back up. The next leaves tell you if the height is right.
Check this first
Bleached or taco'd leaves only at the top, close to the lamp. Raise the light or dim it. The lower plant looks normal. That is how you tell it from a deficiency.
This is identification for a home grow. It is not a pesticide label and not medical advice. Follow your local law.