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LED Plant Lights In The Feasibility Of Agricultural Development


1. LED as a plant lighting the feasibility of the source


The long-term research shows that the photosynthesis of plants in the visible light spectrum (380 ~ 760nm), the absorption of light about its physiological radiation energy of 60% to 65%, mainly in the wavelength 610 ~ 720nm (peak 660nm) (About 55% of physiological radiation), and blue and violet light (about 8% of physiological radiation) at the wavelength of 400-510 nm (450 nm) are the absorption peak areas. Therefore, the development of these two bands (especially the peak) of the artificial light will greatly improve the efficiency of light use. In recent years, with the development of optoelectronic technology, led the high-brightness red, blue and far-red LED birth, to achieve this goal possible. LED can emit monochromatic light (such as 450nm blue, 660nm red, etc.), the spectral range is only ± 20nm, red and blue LED combination, can form and plant photosynthesis and morphology The basic needs of the completion of the spectrum, energy utilization of up to 80% to 90%, energy-saving effect is significant. LED light source of this unique performance, for its greenhouse artificial light, plant tissue culture, genetic breeding, plant plants and other plant production applications provide an effective space for development.


Scholars around the world around the LED lighting applications for many years of exploration, has made many important results. For example, in 1991, Bula and other 660nm red LED and blue fluorescent lamp combination, the lettuce cultivation test, and success. So far, LED has been successfully used for a variety of plant cultivation trials, including lettuce, pepper, cucumber, wheat, spinach, tiger blue, strawberries, potatoes, white crane and algae. LED light source characteristics and the basis of the existing research have shown that, LED as a plant light source with the promotion of plant growth, regulation of plant morphology and energy saving and environmental protection and many other advantages, can be widely used in plant cultivation, greenhouse light, plant tissue culture Factories and aerospace and other fields, is the future of plant lighting an important direction of development.


2.LED as a lighting industry, the feasibility of the lighting industry


In recent years, with the emergence of monochromatic light sources such as LED, domestic and foreign institutions around the livestock and poultry on the light color, light intensity and photoperiod and other needs of the mechanism of in-depth study, proved the light and environmental requirements of livestock and poultry related parameters. For example, the study found that AA broilers in the early growth stage using green or blue light irradiation, the late growth of blue light, can significantly promote the growth and development of broilers and improve their performance; broiler early (0-7d) use green lighting, Blue and green light can make the retinal area, the total number of retinal ganglion cells (RGCs) increased from the central region of the retina to the periphery of the Ministry of the surrounding area of the retinal ganglion cells (RGCs) increased, , The decrease of RGCs density in the green light group and the RGCs size gradient of the blue light group were the most obvious. In order to improve the physiological rhythm, feeding behavior, growth and reproduction performance of chickens, we determined the light color, light intensity and photoperiod to optimize the light color, light intensity and photoperiod of the breeder. Such as poultry products "pollution" (such as drug residues, hormone residues, etc.) the negative impact, greatly improving the production potential of chickens. All of these studies show that LED practical application in animal husbandry is feasible, through appropriate LED light regulation, can significantly promote the growth of livestock and poultry, improve their immunity, greatly improve the production potential of livestock and poultry breeding.


3. Feasibility of using LED as light source for microalgae culture


LED has a low cooling load, high efficiency of electro-optical conversion, can be set at a specific wavelength of light quality characteristics of algae cell culture is a very suitable artificial light source. In addition, LED light source wavelength can be accurate to 1 nanometer, can achieve different light quality of any ratio of the unique advantages, so that the culture of microalgae with other light source can not match advantage. Such as South Korean scientists have shown that with LED light source can improve the efficiency of photosynthetic microalgae, and then increase the density of microalgae cultured cells. China's Jinan University Xu Mingfang, who studied the LED integrated light on the growth of Spirulina and found that compared with the cold white fluorescent fluorescent lamp using LED integrated single-color red light radiation, spirulina cultivation efficiency improved significantly. These studies not only show the feasibility of LED in microalgae culture, and the effect is extremely significant.


As an important part of modern agriculture, artificial light sources play an increasingly important role in intensive cultivation, aquaculture and other fields. Traditional light sources such as high pressure sodium lamps, incandescent lamps, fluorescent lamps, etc., can not meet the needs of plants and animals, Energy consumption, not easy to control and many other issues, the emergence of LED light source for agricultural production and efficient energy consumption provides a possible, LED not only issued a narrow light monochromatic light, such as red, orange, yellow, green, blue , Infrared, etc., and according to the different needs of any combination of animals and plants, but also low-heat characteristics of the cold light source, you can close exposure to plants, improve space utilization. Not only for the growth of agricultural biology to provide reasonable light conditions, reduce pesticides, hormones and other chemicals used to ensure food safety, but also low energy consumption of the green light source, has broad application prospects.

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