What is a light burn and how do you fix it on your cannabis plants, read this https://cannabis.net/blog/how-to/how-to-spot-and-treat-a-light-burn-on-your-cannabis-plants

1. 7/1/2020 How to Spot and Treat a Light Burn on Your Cannabis Plants
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LIGHT BURN MARIJUANA PLANTS AND LEAVES
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How to Spot and Treat a Light Burn on Your
Cannabis Plants
How can you spot if a light is burning your marijuana leaves and buds?
Posted by:
Joseph Billions , today at 12:00am
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How to Spot and Treat a Light Burn on Your Cannabis
Plants

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Light burn is the yellowing of your plant leaves as a result of excessive lighting saturation or proximity of the plant to the
light source which puts some stress on the leaves closest to the source of light. Light burn is said to share symptoms
with nitrogen de ciency which also causes yellowing of the leaves though they start from the bottom of the leaves and
fall o the plant easily. But with a light burn, the leaves typically start pointing upwards, grow pale, and then start
turning yellow though the insides veins remain green and don't fall o the plants easily. Light burn does not only cause
your leaves to yellow but can also turn them white and brown tips to give them a ‘burnt’ look.
Light Burn is an easily treated condition that occurs mainly with indoor cannabis plants. Though it could also a ect
outdoor plants in cases where it was grown in the shade before being exposed to the light which it might not be used
to, otherwise, the distance of the sun is too far out to a ect your cannabis plants. This is why it is recommended that
any changes you want to introduce in your cannabis cultivation system should be done slowly and methodically to
prevent your plants from experiencing shock or stress.
Symptoms of Light Burn
Generally, there are other conditions that seem similar to light burn but there are a few symptoms that could aid you in
identifying light burn in your plants. These symptoms include:
Bleached Buds
This is a very obvious symptom of light burn in your plants. The bleaching of your owers typically occurs as a result of
the plants' proximity to the grow lights. The use of high powered grow lights in your grow space allows the plants to
slowly turn white if they are too close to the lights. This bleaching of the owers from your plants is very hard to miss
and indicates that the buds are no longer useful. What this means is that the introduction of heat to your plants has
caused the cannabinoids to degenerate and therefore reduce the potency of the buds. The terpenes responsible for the
taste and smell of the buds are also a ected which makes them di erent and not very attractive for use.
Yellow Leaves (https://cannabis.net/blog/how-to/yellow-cannabis-leaves-how-to-treat-them-and-prevent-them-in-the-
future)

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Though yellowing leaves are also an indication of Nitrogen de ciency, they are also a very signi cant symptom of light
burn. To identify if it is caused by light burn, check to see if the yellowing starts from the top of the plants and di cult to
remove. For that caused by Nitrogen de ciency, the leaves wilt, fall o , and are easy to remove and also start from the
bottom of the plant.
Treating Light Burn
Distance: The distance between your plants and the grow lights should be increased considerably. This can be achieved
by moving the lights or plants in your grow space to a new location where the parts a ected are furthest from the lights.
Another option is to reduce the number of lights in your grow area a little bit to decrease its intensity and e ects on the
plants. It is also important to keep in mind the type and wattage of the light being used as some lights such as HIDs emit
too much heat compared to others such as LEDs
Low-Stress Training (LST) (https://cannabis.net/blog/b2b/what-is-lowstress-training-for-your-cannabis-plants-
lst): Though the method is used in increasing plant yields, adopting the LST technique for your plants is another way of
treating a light burn. Keeping the branches of the plant at the same height or bending it sideways in a certain position
as it grows taller ensures that the plants are not too close to the lights.
Temperature: The temperature of the grow area should be reduced to keep it ideal for your plants. You can do this
with the aid of cooling fans to help minimize the e ect of the heat emitted by the lights. Just ensure to consistently and
slowly reduce the temperature in the room to give the plants the ability to adjust to the new conditions.
Preventing Light Burn
The use of lux meters should be adopted by growers to allow them to gauge the amount of light the various parts of the
plant are exposed to. The lux meter measures the lux (light illuminance) per square meter to get the intensity of light
readings in that area. This will determine if the plants are not getting enough light or are getting too much which
exposes them to light burn. The plants should be getting an average of 35,000-70,000 lux in the vegetative phase and
about 55,000-85,000 lux during the owering phase for healthy growth. If the readings are above this and you notice

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any of the symptoms above, you should change the position of the plants in relation to the light source. Lux meters are
an ideal tool for small scale growers as they are cheap enough for their operations compared to other light measuring
devices available.
CANNABIS LIGHT PROBLEMS, READ MORE..
(https://cannabis.net/blog/how-to/yellow-cannabis-leaves-how-to-treat-
them-and-prevent-them-in-the-future)
HOW TO TREAT YELLOW LEAVES ON CANANBIS PLANTS? (https://cannabis.net/blog/how-to/yellow-cannabis-leaves-
how-to-treat-them-and-prevent-them-in-the-future)
OR..

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(https://cannabis.net/blog/b2b/what-is-lowstress-training-for-your-
cannabis-plants-lst)
LST OR LOW STRESS CANNABIS PLANT TRAINING? (https://cannabis.net/blog/b2b/what-is-lowstress-training-for-your-
cannabis-plants-lst)
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