How does the spectrum of led Cannabis light affect the growing industrial Cannabis plants

How Does The Spectrum of LED Cannabis Light Affect The Growing Industrial Cannabis Plants?

Legal cannabis cultivation is basically indoor cultivation. In an indoor closed environment, sunlight is scarce, and led cannabis light lighting is an indispensable growth condition for cannabis. There are many kinds of plant light in the market, and their functions are different. To find suitable cannabis growth light, we must have a deep understanding of the effects of LED plant light on the growth of cannabis. We must study the effect of different spectra on the growth of cannabis.

What is spectrum?

Natural light is composed of a variety of lights of different colors. The coincidence of a variety of lights causes the natural light we see to show white. The wavelengths of different colored light are different and the refraction angles entering the medium are different. According to this characteristic of light, the light of natural light passes through the prism. We can see that the white light is divided into a continuous spectrum with different colors, which is the visible light component of the white light.

After years of research, the growth of plants is closely related to the changes of the external environment, in which sunlight is a very important factor. Sunlight not only brings energy to plant growth, but also brings growth signals to plant growth and regulates the growth state of plants. It is difficult for people to control the state of sunlight. The growth state of outdoor plants is not controlled by growers. With the development of agricultural technology, many crops now grow in an indoor environment. Growers can adjust nutrients, carbon dioxide concentration and light spectrum, and crops can grow in the ideal direction of growers.

What is the “best” spectrum for growing cannabis ?


This is a very interesting question. Different spectra have different effects on the growth of cannabis. Each spectrum has its own unique effect. The requirements for spectrum at different stages of cannabis growth are also different. There is no best spectrum for cannabis growth, but at different stages of cannabis growth, Growers can choose the best spectrum for cannabis growth according to their own needs and cannabis growth environment.


Why can cannabis plants respond to the spectrum?

When grown outdoors in the sun, the received spectrum actually provides the cannabis plant with a lot of information about what is happening in the world around it. In spring and summer, more blue spectrum reaches the surface.

With the arrival of summer, the sun is gradually strong, and the spectrum of sunlight has changed. Cannabis and other related plants are affected by the signal of spectrum change, and their own growth status has also changed. The leaves will grow and grow rapidly. The purpose of plants’ growth is to absorb more sunlight in the bright summer sun and grow better. According to the research, the signal of sunshine change from spring to summer is the blue light in the sunlight transmitted to plants.

Blue light-Blue light can promote the growth of cannabis leaves, inhibit the growth of cannabis stems, and let cannabis use more nutrients for the growth of leaves as much as possible. The proportion of blue light can be adjusted at the growth stage of cannabis. The cannabis plants grown under this condition are short and grow healthy large leaves.

When autumn comes, the sun changes from direct to oblique. The sun is refracted through the atmosphere, and more red light passes through the atmosphere and reaches the earth. Plants receive the signal of increased red light, understand that summer is over and autumn is coming, and are ready to bear fruit to prepare for the arrival of winter. When exposed to red light, cannabis will accelerate the growth of stems. After growing, the distance between cannabis leaves and leaves can better accept the light and accumulate more nutrients for fruit. At the same time, growing height is also conducive to plant flowers contacting pollen in the flowing air to complete pollination.

Yellow/red light-Red light is conducive to the growth of plant stems. During flowering, cannabis increases the proportion of red light in LED cannabis light, which is conducive to the growth, height and germination of cannabis. Plants growing under red light will enter the flowering cycle more quickly than plants growing under blue light.

Spectrum not only brings energy to plant growth, but also provides signals for plant growth. In order to better adapt to the environment and grow better, cannabis will change its growth state according to different spectra. Growers can use this characteristic of plants to regulate plant growth. For example, if you want cannabis to blossom and sprout early, turn up the proportion of red light in the cannabis plant light; If you want cannabis plants to be low and long leaves, you can increase the proportion of blue light in cannabis LED light. Make good use of different colored light to send different signals to plant growth, so as to make plant growth move in a favorable direction.

How much influence does spectrum have on plant growth?

The light intensity required for the growth of cannabis is relatively high. The light general contains at least red light and blue light. Under these light conditions, cannabis can grow normally. It is not difficult to get the cannabis LED light. There are many LED growth lights to meet these conditions. Some reputable businesses (such as MOKOLight) can sell the right cannabis LED light. Although plants can grow healthily without changing the spectrum, we should make good use of the tools and make appropriate adjustments to the spectrum of plants in different growth periods, which is more conducive to plant growth.

Different plants may respond differently to the spectrum. Some plants are almost unaffected after spectral adjustment, while some may have great changes in their growth state. Light is not the only factor affecting plant growth. Changes in other conditions can also affect plant growth. For example, increasing the proportion of red light in the spectrum will accelerate plant growth. Sometimes reasonable nutrients and carbon dioxide concentration can also accelerate plant growth.

If the light intensity of the light irradiating the plant is too weak, even if there is a lot of blue light, the plant will not grow leaves, and the plant will grow as high as possible, because when the light is insufficient, the plant will grow as high as possible to obtain more sunlight; If the plant receives the yellow light with high light intensity, the height of the plant is limited and a large number of leaves will grow, because at this time, the plant obtains enough light and does not need to grow high to obtain more, but growing leaves can enable the plant to obtain more light. Most of the grow light in the market are full spectral grow light or red and blue spectral grow light. The light emitted by them basically contains the spectra needed for the growth of cannabis. Therefore, when selecting cannabis grow light, the intensity of illumination is often much larger than that of the spectrum.

The best way to increase the yield is to increase the light intensity

In other words, giving plants more light than simply changing the spectrum can give you a greater yield return. Therefore, if it is possible for your plants to get more light (the highest), even if you add light in the “wrong” spectrum, this will increase your yield. Even bright white fluorescent light immersed in the green spectrum can promote plant growth, if you don’t care about energy consumption.

Delve into how the spectrum changes the way the cannabis plant grows

Light is part of the electromagnetic spectrum, including not only the visible spectrum, but also X-rays, gamma rays and infrared light. Plants react to the spectrum through a process that is completely separate from photosynthesis (called photomorphogenesis).

Unlike animals, plants cannot change their growth position. If their roots are born there, they are destined to grow only in this place, but plants can get the most light by changing their growth direction and height. For example, the direction of sunflower leaves will be in the direction of sunlight, so as to ensure that they receive more sunlight, and put down their leaves at night to save energy. Like other plants, the growth of cannabis is also regulated by different spectra. According to the information provided by the spectra, it provides the best growth mode for cannabis.

Plant the “smell” spectrum!

Like animals, plants will feel the changes of the environment and make corresponding changes according to the changes of the environment. For example, animals can capture information in the air through their nose. Animals can track the clock to the outdoor direction and position according to the information captured by their nose. Although the nose can lead animals to track the clock to information, animals need their mouth to taste food, and their nose can only smell but not eat. Plants are almost the same. There is a photosensitive system in plants. This system acts like the “nose” of plants and can capture the information in the spectrum. Animals use their noses to find the direction and location of food. Plants adjust their growth state by using the spectral information captured by their noses to obtain the maximum amount of light.

Similar to animals, the “nose” of plants only captures the information in the spectrum, and can not obtain energy from the spectrum. Plants rely on the system similar to the “mouth” of plants to obtain or remove energy from the spectrum.

Plants get energy from the spectrum

Plants can obtain energy from the spectrum. They rely on chlorophyll and carotene in plants, which can produce photosynthetic elements. These elements are equivalent to the “mouth” of plants. Chlorophyll absorbs sunlight through photosynthesis, converts light energy into bioenergy, and provides material and energy for plant growth and development.

Like animals, plants are picky eaters. Not all colors of light can produce photosynthesis. Only a small amount of visible light can produce light and effect with plants. Most light has little effect on plant growth, among which blue light and red light are the most easily absorbed by plants. If you want LED cannabis light to be more efficient, you’d better use the red and blue spectrum grow light.

To get the best effect of cannabis, what should be paid attention to for LED cannabis light:

  1. The power of LED cannabis light is more important than the spectrum. Increasing the light intensity is more important to the growth of cannabis than improving the spectrum, and the effect is more obvious and direct.
  2. If you want to grow cannabis leaves, you should increase the proportion of blue light in LED cannabis lights. Blue light can effectively promote the growth of cannabis leaves.
  3. Led cannabis light can promote the growth, germination and flowering of cannabis by increasing the proportion of red light
  4. a small amount of other colors can be provided in the cannabis grow light. Although red and blue light can meet the light requirement of plant growth, proper other shade can make the plant grow healthier.
  5. As long as the high-quality LED cannabis light(such as MOKOLight led grow light) is used, there is no need to worry about the spectrum. If the growth of cannabis does not achieve the expected effect, please increase the light.


I hope this article can help you grow cannabis, and I hope your cannabis can thrive!


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