The growth of plants is inseparable from the light and heat provided by the sun. Different light color, light intensity, and light time have different effects on plant growth. Sunlight is composed of countless continuous light of different wavelengths. In these spectrums, A large amount of radiant light has no effect on plant growth, and the effect accounts for only 5% of the spectrum. Through research, it was found that in all spectrums, red and blue light can promote photosynthesis in plants and promote plant growth. Artificially developed with a specific spectrum The light source can supplement specific light when the light is insufficient. Red and blue LED plant lights are widely used in indoor cultivation and greenhouse cultivation. The wide use of red and blue LEDs saves electricity consumption and reduces electricity bills. The best red and blue LED.
The effect of red and blue light on plant growth
The wavelength of visible light is about 400–720nm. Plant growth needs visible light, which provides material and energy for plant photosynthesis. Among these visible lights, blue light (440–480nm) and red light (640–680nm) have the greatest impact on plant growth, and this Both frequencies of light are best absorbed by plants. Plants absorb green light the worst (520–610). Most plants absorb very little green light and reflect all green light. We can see that many plants in nature are Green. What color a plant shows represents the poorer the plant absorbs that color. Following this principle, most plant lights are red, blue, or a combination of red and blue.
The light absorption process of plants occurs in the chloroplast. Chlorophyll is the main body of plants for photosynthesis. Plants do not use all components of sunlight for photosynthesis. In the red region with a wavelength of 640–660nm, chlorophyll a has a strong absorption peak: Chlorophyll b has a strong absorption peak in the blue part of 430–450nm. The red spectrum is the energy source of photosynthesis, and red light promotes the growth of plant stems. Blue light can promote the opening of stomata and help external carbon dioxide enter human cells, thereby improving the Its photosynthesis rate. Blue light promotes the growth of plant leaves. In addition to the intensity of artificial light, the effect of artificial light also depends on the physiological radiation characteristics of the light source radiation spectrum that can be effectively absorbed by plant leaves for photosynthesis. Different supplementary light sources have different physiological characteristics Radiation characteristics. In the visible spectrum of the light source, from 400 to 760 nanometers, the light energy absorbed by plants accounts for about 60% to 65% of the physiological radiation light energy. Among them, it is mainly red light radiation with a wavelength of 600 to 700 nanometers , the light energy absorbed by the plant accounts for about 55% of the physiological radiation light energy. The photosynthesis of red light is the strongest, and supplementing the light with a light source rich in red light will make the plant bloom earlier, promote the accumulation of plant dry matter, and promote the bulb The formation of , tubers, leaf bulbs, and other plant organs. Second, it is blue light radiation with a wavelength of 400–520nm, and the absorbed light energy accounts for about 8% of the physiological radiation light energy. Supplement artificial light with a blue-rich light source , which can delay flowering and make plants for the purpose of obtaining vegetative organs to grow fully. Proper ratio of red light (600–700nm) to blue light (400–520nm) photon flux, namely R/B ratio, can ensure healthy planting plant.
The difference between red and blue spectrum and full spectrum
In order to add light to plants, more and more people are using plant fill lights. There are many types of plant fill lights. For example, LED fill lights have a full spectrum of red and blue light. What is the difference between the two? When using plant fill lights , people should not only pursue the effect, but also consider the effect of supplementary light on the human body. Are the two harmful to the human body?
The spectrum of red and blue fill light consists of red light and blue light, and the full spectrum fill light, as the name suggests, its spectrum is the spectrum that simulates sunlight, similar to sunlight. When using, most people choose to use red and blue light, red light The blue light utilization rate is high, the fill light effect is also obvious, and the power consumption is also very low. It can play a good fill light effect on the growth of plants, but this kind of light is harmful to the human body. The red and blue fill light emits pink light. If people are in this state for a long time, they can feel nauseous and dizzy because of the light color.
Full-spectrum plant fill light will not produce this situation. Because its light is close to natural light, people will not feel physical discomfort even in this environment for a long time. But we must also know that because full-spectrum plant fill light is to imitate the sun Light, there will be a lot of light, the plant utilization rate is low, so there will be some waste, and the power consumption will be relatively high.
Why the red and blue LEDs work
Different frequencies of light have different effects on plants. Visible light is the light required for plant photosynthesis, and the wavelength of visible light is around 400–700nm. Among visible light, red and blue light can promote photosynthesis the most, and plants with the most green light can promote photosynthesis. Minimal photosynthesis. Red-blue LEDs that combine red and blue light are ideal for LED grow lights, and these two light colors are the two most efficient lights for plant growth. Red light is good for the flowering cycle and fruiting of plants, and blue light has It is beneficial to the growth of plant stems and leaves. Indoor and greenhouse cultivation has been developed for a long time, and many artificial light sources that are beneficial to plant growth have been found, such as incandescent lamps, fluorescent lamps, metal halide lamps, and high pressure sodium lamps. These traditional artificial The light source consumes a lot of energy, the light energy conversion rate is low, the luminous efficiency is low, and the transportation cost is high. Improving the light energy conversion rate and reducing energy consumption are the problems that must be overcome in the field of artificial plant lamps. With the development of society, the concept of energy saving is deeply rooted in the hearts of the people. . The demand for agricultural lighting continues to expand, and the consumption of electric energy is also growing rapidly, which is not in line with people’s energy-saving concept. Traditional lighting that consumes a lot of electric energy can no longer meet the needs of modern agriculture. New energy-saving lighting tools usher in development opportunities. Among the lighting tools, LED grow lights can best meet the needs of modern agriculture.
Red and blue LED light distribution ratio customization
The function of red and blue LED grow lights is to illuminate plants and promote plant growth. All solutions must be customized according to the growth law of plants and the needs of light at different stages of plants. According to people’s needs for plants, adjust the LED grow lights in The ratio of red and blue lamp beads (for example, flowers prolong the flowering cycle, fruits have more fruits), make the growth direction of plants more in line with people’s needs, and improve the quality and value of products.
Customizing the proportion of light is a key step in plant lights, and the following steps also need to be controlled. People adjust the growth of plants by controlling air conditions. Air control includes control of light time, light intensity, and light density. Control. Appropriate Increasing the light time of plants can accelerate plant growth and improve crop yield. The light intensity must be greater than the plant’s supplementary light point and less than or equal to the plant’s light saturation point, and the plant can grow healthily. The closer the light intensity is to the light saturation point, the better the plant grows. faster.
Red and blue LED light distribution skills
When red and blue LED grow lights are used for plant fill light, most of the light sources required for plant photosynthesis come from LED grow lights. Different light qualities of LED grow lights have different effects on plant growth. The light emitted by red and blue LED grow lights Mainly red light and blue light. Red light can prolong the flowering cycle of plants and affect the flowering and fruiting of plants; the main role of blue light is to promote the growth of plant leaves and stems, and accelerate the growth of plants. It has certain inhibition on the flowering and fruiting of plants Function. The red and blue configuration of red and blue LEDs has certain skills, and these skills will affect the effect of plant light.
Red light and blue light have different effects on plants. Before configuring the ratio of red and blue lamp beads for plant lights, it is necessary to understand the situation of crops and understand people’s needs for crop growth. For example, lettuce is a vegetable. What people want is Stems and leaves that can be used as food. Promoting the rapid and healthy growth of its stems and leaves is our concern for plants. The ratio of red and blue LED grow lights to red and blue light beads is the best blue light beads; for strawberry planting, we want strawberries Fruit. We want the strawberry fruit to be big and big. When matching with a plant light, increase the proportion of red light appropriately. Red light can promote the growth of plant fruits; for flower planting, our goal is to bloom more and have a longer flowering period. The ratio of safflower to blue light should be appropriate. Red light can promote plant flowering, and blue light can inhibit plant fruit. The ratio of red and blue lamp beads for LED grow lights is roughly between red: blue = 6–9:1. According to different According to the needs and uses of plants, choose different proportions of lamp beads. Sometimes a small amount of green lamp beads are mixed into the LED plant light, and its main function is to adjust the comfort of the light and protect the naked eye.
Red and blue LEDs are better than monochromatic LEDs
Plant photosynthesis is a complex process. Although the overall reaction mechanism is understood, many specific details are not fully understood. Photosynthesis has light and dark reactions, and both reactions are mild or indirect. Take part. Photosynthesis Different substances may be produced under different light conditions, which determine the growth state of plants. We know that red light promotes plant flowering and fruiting, and blue light promotes plant stem and leaf growth. However, if only monochromatic light is used to illuminate plants, most plants Will wilt and die. For example, red light illuminates strawberries, blue light illuminates lettuce, and monochromatic light. They cannot grow healthy under irradiation and will eventually die. Red and blue light are necessary for most plants to grow. Neither First, plants cannot grow healthily. Most of the plant lights on the market are red and blue LEDs.
generalize
WestlandLight has been engaged in the LED lighting industry for many years. A variety of LED grow lights have been developed for different plants and have unique insights into the growth of flowers, vegetables, fruits, hemp, and other plants. By irradiating WestlandLight grow light LEDs, flowers can be extended for flowering cycle, vegetables grow vigorously stems and leaves, fruits and fruits grow bigger and more numerous, and hemp flourishes. Westlandlight’s LED products have been used by many customers. Westlandlight will continue to accelerate research and development, provide customers with better products, and do energy saving and environmental protection for human beings contribute.