Black Light For Plant Growth

Last Updated on October 29, 2022 by Cinthia

Wondering if black light is ideal for plant growth? Let’s find out. Plants require light to grow be it artificial light or natural sunlight. Now, this light comes in the various color of the spectrum. Different light colors are required by your plants at their various stages of growth.

In the atmosphere, ultraviolet light is also emitted in the light spectrum but it’s assimilated by the atmosphere before it gets to the earth’s surface. It is the black light that emits ultraviolet radiation and we will be talking about their effect on the growth of the plant.

Ultraviolet Black Light For Plants Growth
Best Light Temperature For Growing ...
Best Light Temperature For Growing Plants

As we said, blacklight gives rise to ultraviolet light. The ultraviolet spectrum released by black lights is in UVA and UVB. Various light wavelengths are absorbed by chlorophyll and phytopigments known as photosynthetic pigments. The lights are assimilated to carry out the process of photosynthesis.

Among all the colors of lights, chlorophyll vigorously assimilates the blue region more. However, chlorophyll also has strong assimilation for some ultraviolet spectrum portions. The longest wavelength which is found in UVA is firmly assimilated by chlorophyll plants.

Ultraviolet Black Light For Plants Growth

Effect Of Black Light (UV Light) For Plant Growth

The effect of ultraviolet light varies with different plants. You need to be cautious if you wish to make use of black lights for your plants’ growth. This is because too much ultraviolet radiation can cause great harm to phytopigments.

Growing plants under black lights alone in the absence of white light may be damaging to your plants. You will be depriving them of benefiting from other colors of light. Your plants may grow with a blacklight but they will start to grow leggy because they are looking for any other bright colors.

Also, your plants’ chances of blooming with black lights are very slim. However, in a safe dose, your plants may benefit from ultraviolet black light.

  • Effect Of UV Light on Microorganisms

Microorganisms in plants offer both good and bad effects. There is some microorganism such as bacteria that affect plants negatively by causing rust and wilting which give rise to diseases. Ultraviolet light can help kill these harmful bacteria. It can also help kill pathogens.

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However, we also have some beneficial bacteria such as the nitrogen-fixing bacteria present in plants. They help fix nitrogen used by plants. The ultraviolet light always ends up destroying beneficial microbes which play a vital part in the development of your plants. Thus UV is not ideal for the use of killing microbes.

  • Effect Of UV Light On Plants’ DNA

Generally, it’s known that UV rays are pretty damaging to any life form. Now, UV rays are damaging to proteins, DNA, and lipids. So, if the DNA of a cell gets impaired, the genetic substance depreciates and this may bring about mutation or programmed cell death.

Although the damage done with the DNA may usually not be adverse, it may end up causing mutation in plants. Now, a mutation in plants may give rise to significant diversity which will result in better-surviving plants or even organisms.

But generally, plants don’t really need ultraviolet light because it actually brings more harm to plants than good. But in a situation where plants end up getting UV light, it forces a reaction that protects plants and ends up boosting their properties.

Effect Of UV Light On Plants’ DNA

  • UV Resistant Crops

The earth continues to experience some climatic crises. This has been causing the ozone layer that protects the earth from the sun’s UV rays to deplete. Our worry is how damaging can this cause to both humans and plants.

The good news is that researchers have been working on the effect of UV on crops and how they can be protected. Researchers have conducted laboratory experiments showing that plants are adapting. It shows that outdoor plants exposed to more UV rays have begun generating molecules to obstruct UV lights.

Therefore, plants can now thrive in severe climatic conditions. At the same time, plants can use UV light to their advantage to fighting diseases bothering the plant.

However, UV light is generally detrimental to plants and the negative effect of UV black lights outweighs their advantages.


Does ultraviolet light help with Plant Growth?

The answer depends on what you are growing. The most common UV wavelengths used for indoor horticulture are 365nm, 390nm and 385nm. If you are growing plants that require a lot of light, such as tomatoes, peppers or cucumbers, then the plant will be able to grow normally with a certain amount of UV light.

However, if you are growing plants like broccoli, kale, Brussels sprouts, spinach, cabbage, carrots, parsley, basil, lettuce and other leafy greens, then you will need more than the standard UV dose that comes from the sun. If you are growing these plants, you can use an UV lamp, which is available at nurseries and hardware stores. The UV light for horticulture comes in three different wavelengths: 365nm, 390nm and 385nm. These three wavelengths are used for different types of plants. Some plants require UV light at all times while others require it only in the daytime. The most common wavelength used for indoor horticulture is 365nm. This is because the 365nm wavelength has been proven to be the most effective in providing the optimal amount of light for plants.

What’s the relation between UV and plant growth?

Ultraviolet (UV) radiation is part of the electromagnetic spectrum, which includes visible light, radio waves and X-rays. It consists of wavelengths shorter than that of visible light, but longer than those of X-rays. Ultraviolet radiation comes from the Sun, and it can also be generated artificially by high-intensity light bulbs. Ultraviolet radiation is important for plant growth and development because it helps in regulating the balance between the processes of photosynthesis and photorespiration.

How sensitive are plants to black lights?

Ultraviolet (UV) radiation is a form of solar radiation that can cause sunburn, skin cancer and other serious health problems. UV-B radiation causes skin cancer and cataracts; UV-A radiation is responsible for tanning of the skin. Although most plants are sensitive to UV-B radiation, some species have evolved ways to protect themselves against it. The same protective mechanisms apply to UV-A radiation, but they are not as widespread in nature.

Sunlight is composed of visible light, ultraviolet (UV) light and infrared light. The spectrum of UV light is divided into three bands: UVA, UVB and UVC. The UVA band, with wavelengths between 320 and 400 nm, penetrates the atmosphere and reaches the earth's surface.

Does it affect the DNA od plants?

Not always, but it can cause mutations and damages. You should research which plants are resistant to UV rays and which ones are not.

Black Light Plants Final Note

But does a black light help plants grow? It is now clear that black light does not have a great effect on the growth of a plant. Using only black light will not enhance growth as plants require a wide light spectrum to develop adequately.