Page content

Light Burn On Marijuana Plants

Light Burn On Marijuana Plants

There is only so much light your marijuana plant can take. At some point, the plant will show evidence of strain around the main points where it receives light. Brown or yellow spots will show up on the leaves, followed by burnt tips and the borders will remain green.

In the spots where it’s getting an excess of light, the leaves will look burnt. Learn how to identify and prevent light burn on your marijuana plants

What is light burn

Light burn on cannabis

Your buds can turn albino through light bleaching. This frequently happens with high-power LEDs and HPS lights that are placed too close to the top of the plant. As a result, your plant gets way more light than it needs.

Once your buds are burnt, their strength diminishes and may get to the point to where it has no THC. So, the moral of the story is: make sure you don’t give them too much light to prevent any bleaching.

Download my free marijuana grow guide at this link for more on light burn

Calling light bleached marijuana names such as “white cannabis” or “albino cannabis” is not a good thing. The fact that it is white is a sign that it is in bad condition. This is not what you want.

How to fix light burn

How to fix light burned cannabis leaves

If you think the plants are getting more light than is necessary, start by sliding the grow light farther from the top of the plants.

Light bleaching because of sunlight is very rare when outdoor growing and there is no way they will ever get too close to the sun. If you move your plants from a bad situation, then into the sun they may display sign of light bleaching if they never had a chance to adjust to the increase in light.

Take it slow when adjusting your plants conditions. You don’t want to stress your plant out for either outdoor or indoor growing.

Maintain a cozy temperature consistently for the best results and health. Think about it like this, if you feel like it’s too hot, then certainly it’s too hot for the plants. Things aren’t as simple for outdoor growing, but take the time to learn what to do for outdoor heat.

Marijuana plant symptoms

Cannabis plant symptoms light burned leaves

Tips/Edges are burnt or brown
Leaves turn pale in color
Brown spots
Top leaves / new growth is damaged
Veins of leaves remain green

Remember that plants with strong genetics have less change of getting sick and are less vulnerable for environmental stresses, diseases, nutrient deficiency’s and pest. So make sure to buy marijuana seeds from a trusted seed bank.

Thanks for reading. Please leave comments or questions below and don’t forget to download my free grow bible.


Download the Ultimate Grow Guide for FREE!
Learn the basics of growing marijuana and get started today
  • How to get the biggest yields from cannabis plants
  • What you need to get started, without wasting money
  • The most common mistakes you do not have to make
We guarantee 100% privacy.

Comment Section

12 thoughts on “Light Burn On Marijuana Plants

By Andrew Franko on 30 July 2015

I got five AK-48's. Two of the five didn't pop (so sad). One of the other three is looking good. The other two sprouted but are slow growers. They have very thin stems, is that normal? I started these on July 20th. They are being grown in half gallon pots outside. I will transfer to five gallon buckets and bring them inside if they live. I'm using Black Gold soil and tap water. The water comes from a natural reservoir thru a treatment plant. I've used no additives yet, nor have I checked PH. This is my first attempt at growing. Will use for nerve pain if it will help. If anything I should get a good buzz. Any suggestions???

By latewood on 31 July 2015


You have to be patient. I am not sure starting the seeds in Black Gold. That soil may be too hot for seedling, but you will find out shortly. If tips start to curl, and dry out, the soil is too hot.

One does not add nutrients to plants until they have 4-5 strong sets of leaves. With that soil; You probably will not have to add nutrients until the plant is in the flower stage. Hope this helps.

By trisha on 30 August 2015

i have 2000 watts going in my grow room where should i set my aircondtioner at

By latewood on 2 September 2015

You adjust your AC to a setting you feel comfortable with. Ideally, you want you temps to be between 70-80f, or 20-25c.

In order to get temperatures stable, you adjust the AC day by day, until you find the right range of settings. Once you have the temp adjustment stabilized, you will be good to go.

By Tom on 23 December 2015

How would the combination of a 400 watt H/P and a 1200 watt 10 watt split LED work for getting the best of thoes worlds be for my girls?? Buy the way great seeds.

By Billy graham on 1 December 2016

I bought 15 seeds, 5 of 3 different types, i planted 2 of each (6). All 6 started to grow. I thought this will be great. Im growing indoors in a fish tank. Foil insides to help with light, flouresant lights on top of tank on the floorin my closet, i keep Door open. I also fan a fan in the closet to help move air circulation. I started using distilled water, then i read that water doesnt really matter so i went to tap water the plants got to 4 to 5 " in height, there is only 4 left, and they are not looking good either, dam a costly experience.....i failed

By Roy ILGM on 2 December 2016

Sorry to hear your grow didn't work out Billy. Maybe our experts on the support forum can help out!

By Jared on 5 December 2016

I have one that is light burned. Used a R30 65watt flood grow bulb and a 15watt florescent black light. I recently just purchased a 15watt florescent plant and aquarium bulb. I now run the F15 all day and turn on the flood light every now and then. The F15 is about 5½ inches away and the flood light is 12½ inches away.have one backside long mirror behind. With both lights on it is warm to the hand. Finally there is hope. Any ideas on just how far to put both lights full blast? All day?

By latewood.ILGM on 5 December 2016


Never run lights all day. 19 hours a day max. I jhave no idea what type lights you have so I cannot advise you. I will say that flood lights are generally not suited to growing, but you said you had a "grow flood light???".

You would be better served to go and join our support forum. There you can post pictures and get the informed advice that you need.

See you there! 🙂

By 4rth grow on 23 September 2017

myplants are 4 weeks ihto veg starterted showing burt tleaf tips then started curling .I Set the liights further back .immediaty started looking better but still worried about the clawing and twisting that took place. .will they be o.k now?

By Newby on 31 August 2018

my light rig has failed at 106 days, was beginning to flush for a harvest date of 91318; I cannot get another rig for 36 hours. Should I harvest now?

Leave a Reply