Hello my friend
SIGNS AND SYMPTOMS OF LIGHT BURN
When your plants suffer from a light burn, it is usually the leaves at the top, directly under your lamps, that will be affected. They will turn yellow and eventually die. But the burn by light does not always appear immediately by yellow leaves. Sometimes leaves can start by pointing upwards, before taking on a different color.
DISTINGUISH BURN SYMPTOMS BY LIGHT OF NITROGEN DEFICIENCY
Some cannabis cultivation problems, such as nitrogen deficiency, may also show yellowing leaves, but there are ways to distinguish one problem from the other. The most obvious difference with nitrogen deficiency is that the light burn affects the leaves at the top, close to your lamps, while the nitrogen deficiency usually starts in the old leaves at the bottom of the plant.
Yellowing leaves due to nitrogen deficiency will also fade, curl, and usually fall on their own. In contrast, the burned leaves normally remain on the plant and are not easy to pull off. Yellowing due to a light burn also keeps the inner veins of the leaf green, which is not the case with nitrogen deficiency.
But yellowed leaves at the top of the plant are not the only symptoms of a light burn. Sometimes the leaves may also have a reddish or purple coloring, with brown spots and burnt leaf tips or edges.
Good luck for your grow 😉
May the force be with you 🌱