(1) agricultural lighting huge demand. To fill the greenhouse as an example, lighting facilities are basic essential parts in the modern glass greenhouse, currently has 0 China glass greenhouse. 350 thousand hectares, while the world's total glass greenhouse area reached 4. 90 thousand hectares, if taking into account the world reached a total area of 2 million 830 thousand hectares of plastic greenhouse, the greenhouse lighting market demand will be bigger. Electric light source is also a necessary and easy to consume tissue culture seedlings, therefore, LED tissue culture dedicated light source has a long lasting consumer market. China is the global production base and export base of plant tissue culture, and also the largest market of tissue culture seedling in the world. Since the mid 90s of last century, the Chinese mainland to undertake the global industrial group to cultivate seedlings of industrial transfer, and now this industry transfer process has been completed. According to the Ministry of agriculture statistics, as of the end of 2007, the annual output of more than 10 million strains of tissue culture enterprises, there are more than and 300, the total area of plant tissue culture in more than 20 million square meters, the annual output value of about 20 billion yuan. In addition, plant plants, especially artificial light plant plants also have a huge demand for LED light source. At present, commercial plants are mainly distributed in Japan, the total number reached 50, of which 35 are completely artificial lighting, with plant factory technology matures, the factory application plant will also be an important market for LED applications. In addition to photosynthetic lighting, LED other aspects in the field of agriculture also has great application space, such as the physical control of agricultural pests, LED light source can be used at specific wavelengths, to lure and kill pests, reducing pesticide application amount, to achieve safety and green production for animal breeding; it can according to the different breeding purposes (such as meat, egg, milk, etc.) with a specific wavelength of light to promote the implementation of LED animal productivity, reduce the use of feed additives and hormones, to achieve efficient green production; for sea fishing, LED light source can be used for a specific wavelength, induced by seafood, improve the amount of fishing; for microbes, can be used to promote the beneficial microbial proliferation of specific wavelength of LED implementation to achieve light, high efficiency, anti microbial intensive production Stress process. Compared to the traditional light source is difficult or unable to meet the requirements of these special applications, so fully open up the application of LED in these areas will also bring considerable market demand for the application of LED in the field of agriculture. (2) compared with the traditional light source LED in the lighting field has obvious advantages in agriculture. LED has many advantages, such as high light efficiency, low heat, small size, long life and so on. In the agricultural field of lighting, compared to the traditional light source, its advantage is reflected in the more prominent: a. High energy efficiency. The research shows that the photosynthesis of plants is the use of wavelength of 610~720nm (peak 660nm) orange light, the absorbed light energy accounted for about 55% of its physiological radiation; second is the wavelength is 400~510nm (peak 450nm) blue and violet light, absorbed light energy accounted for about 8% of its physiological radiation. The radiation spectrum of traditional light in red and blue, there are still a lot of green light and infrared light, the spectral composition is not effective on plant photosynthesis; on the other hand, the radiation spectrum of traditional light on plant needs are often not balanced, for example, there is a blue light fluorescent lamp components too much. These the use of plants to reduce the rate of traditional light source radiation energy. In contrast, the use of LED as a plant source, you can control the radiation spectrum of all red and blue bands, and the red and blue light can be accurately adjusted according to the different needs of different plants, the radiation energy can be completely absorbed by plants, compared with the traditional light source, greatly improves the efficiency of biological. B. Can greatly improve the plant density. On the one hand, because the LED light source is compact, the volume is greatly reduced compared to the traditional light source; on the other hand, because of the traditional light source will be a lot of heat radiation to the plant surface, so in its use as a light source of plants, and plants that must be kept in a certain interval, such as high pressure sodium lamp when in use, the general requirements at least with plant spacing of 1m, and the LED is a cold light source, thermal effect of the radiation spectrum of plants is far less than the traditional light source, even if brachytherapy will not cause plant burns, so as to realize the close distance irradiation on plant, in the factory or plant tissue culture can greatly shorten the distance between the cultivation layer frame. To improve the space utilization efficiency, greatly improve the unit space planting density of plants. C. LED agricultural lighting application of the energy saving effect is significant. Lighting is one of the main energy consumption in agricultural production. According to statistics, in the production of fluorescent lamp tissue culture, lighting energy consumption accounted for 30%~40% of the operating energy consumption, while in the fluorescent lamp plant plant, this share is as high as 82%. The use of LED to replace the traditional lighting source can greatly reduce the energy consumption of agricultural production. Such as Holland in the greenhouse using light LED experiments show that compared with the traditional high pressure sodium lamp and metal halogen lamp, LED energy-saving 50%~80%; in the plant factory, using the traditional light source per square meter needs to be equipped with 0. 5 kW light source, while LED requires only 0. 27 kW, so that power consumption can be reduced by about half. In the field of culture, national culture in a total area of more than 20 million m2, if a year by tissue culture daily illumination time is 16h/d, the annual 300 day production date is caused by fluorescent lamp in the total power consumption in more than 107 billion 500 million kW h; with LED, the annual total power consumption in 51 billion 800 million kW - H
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