Have your cannabis had Light Stress or Heat Stress with lights

For indoor growers or the growers who increase yields, light is essential. However, if you misuse the lighting systems, your crops will suffer the consequences of burn or light stress. This article discuss why your plants got hurt by light and how to avoid these problems with LEDs.


How can your light hurt your cannabis? 

On the one hand, all lights produce light energy and heat energy when working. In the growth of cannabis, light energy is absorbed by plants during photosynthesis, while heat energy cannot be used by cannabis.  When the growth temperature of cannabis is higher than 28℃, the photosynthesis is hinderedit.(We explained it in this blog How to choose LED grow light for your indoor cannabis?) Your leaves will get yellow or brown brown spotting and may appear generally burnt in places for protecting itself. We call it Heat Stress.

On the other hand, many growers think more light and more buds. In theory, it is correct. However, photosynthesis is affected by many factors including carbon dioxide, photon density, temperature, oxygen, water, minerals, age, leaf anatomy and more. In many cases, the photosynthesis limits are largely dictated by the concentration of CO2. When the concentration of CO2 or nutrient are not enough, but there is too much light, leaves reach their saturation point the plant. Your cannabis also attempt to protect itself by turning yellow or otherwise ways. We call it Light Stress.

This cannabis plant is suffered heat stress:

It’s also common for leaves to curl up or down, fold inward like conoes or tacos, and for the serrated edges of leaves to start flipping up. 

The edges of the leaves will begin to curl up and the leaves will begin to “cup.” 

Buds to grow airy with ugly foxtails

This cannabis plant is suffered light stress:

Yellow leaves at the top of the plant directly under the grow lights 

  All the leaves start pointing up or “praying” 

Edges of leaves to turn up

More situations need to be discussed in detail according to your growing environment. This article will not start the discussion, if you want to know more, just Contact us. So how to distinguish what damage your cannabis is very important! 

How to avoid these problems with LEDs?

Control your ambient temperature

 The ideal temperature for growing cannabis

You can choose a fan or air conditioner to control the temperature according to your budget. Or you can choose a grow light with better heat dissipation capacity. For example, the Groplanner O Series all use high-quality aluminum, 3D cool fin disign. It emits 63% lower heat than HPS, and 12.1% lower than LED grow light from other brands(In fact, the heat generated by the light will not only increase the ambient temperature, but also cause light decay. So the heat dissipation performance is an essential detail to determine whether an LED grow light is good or bad. We will explain in detail the knowledge about LED heat dissipation for you in the future.)

It is possible to partially shield your plants when you know the temperature is going to get hot. You can also adjust your watering schedule to make sure plants at least have plenty of water.

Dimming lights and/or move them further away from your plants 

You can adjust your light through On-board dim knob (Groplanner I Series), APP (Groplanner O Series) or Daisy chain. All of Groplanner Grow Light can be dimmed, you can choose according to the control methods you want. If your light cannot be dimmed, you can move them further away from your plants. If you can’t move the light further away, bend your plants over so the tops are further away or if your plant is still in the vegetative stage you might even consider cutting off the top of the plant to remove some of that height.


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