LED plant lighting to support key future market prospects

Modern facility agriculture is an important way to guarantee national food security and agricultural products in the future, and its industrial status has been increasing year by year. China is a big country in the development of facility agriculture. "From the development status of agricultural lighting, China's facility agriculture has reached more than 4 million hectares, of which greenhouse greenhouses and plant factories are growing rapidly," said Wu Chuyu, consultant of the China Lighting Society and secretary general of the Agricultural Lighting Committee. The development of modern facility agriculture urgently needs the support of intelligent light environment regulation and semiconductor lighting technology. Although China's agricultural semiconductor lighting started late, it has developed rapidly. "Application research of semiconductor lighting source in plants" is the national "863" key support project. one.

The development of agricultural semiconductor lighting industry has broad prospects, but there are also many problems. The development of its industry requires multi-disciplinary integration of electric light source, agriculture, control, etc. It is imperative to speed up the development of industrial industry and expand industrial application. “I hope that agricultural lighting will be gradually developed in 2015-2017.” Wu Lao said that greenhouses are now using lighting appliances, but there is still a lack of reasonable lighting design. The Agricultural Lighting Committee’s series of agricultural lighting training aims to train specialized Talents promote agricultural lighting R&D and design and sustainable development of the industry.

The fourth generation of semiconductor solid-state light source-LED application in agricultural lighting is the biggest advancement in the development of agricultural lighting, with a milestone significance. From a long-term perspective, LEDs have gradually replaced traditional lighting sources, and LED light sources have become more and more widely used. Vice Chairman and Secretary General of the Agricultural Lighting Committee, Ph.D., Research Fellow, Institute of Agricultural Environment and Sustainable Development, Chinese Academy of Agricultural Sciences Liu Wenke introduced the application of LED lighting in many fields such as greenhouse light supplement, edible fungus factory, plant factory, plant tissue culture, livestock and poultry and aquaculture and pest control.

Among them, the plant factory is an efficient facility agricultural system that achieves continuous crop production through high-precision environmental control in the facility. It is the highest stage of facility horticulture; it can be used for vegetables, seedlings (vegetable seedlings, rice, tobacco, etc.), Chinese herbal medicine, etc. Large-scale production. According to Mr. Liu, plant factories can increase production efficiency by 40-108 times (Kozai, 2013). The contribution of LED light sources to plant factories includes energy conservation, multi-layer stereo cultivation, and on-demand regulation of light environments. At present, the number of artificial light plant factories in commercial operation has increased year by year, with more than 100 in Japan and more than 30 in China.

In addition, based on the development status of facility agriculture and the basis of photobiology, Mr. Liu also discussed the advantages of artificial light environment regulation, LED light source facility agriculture, development status, expectations, and LED agricultural lighting technology, design principles and types of lamps.

Vice Chairman of the Agricultural Lighting Committee, Ph.D., Department of Light Source and Lighting Engineering, Fudan University, and Chen Wencheng, Senior Application Technology Manager of OSRAM Opto Semiconductors (China) Co., Ltd., from a technical point of view, elaborated on the four metering systems and their algorithms related to plant lighting. The meaning of each optical parameter, the effect of different wavelengths of photothermal radiation on plants and the environment, the spectral distribution of common plant illumination sources, the commonly used evaluation indicators and conversion of agricultural lighting, the common measurement techniques of agricultural lighting, and agricultural lighting and common light sources.

Among them, when talking about the evaluation index of plant lighting, Teacher Chen pointed out that the evaluation of plant illumination cannot be described by photometric quantities such as lm/w, or lx, and all photometric quantities are based on the spectral sensitivity curve of the human eye. Photosynthetically active irradiance is usually used before there is a recognized plant spectral sensitivity curve.

However, in the actual measurement and calculation, the instruments for measuring PPFD on the market are not universal, the price is expensive, and the auxiliary design software is lacking. The PLA-20 handheld plant lighting analyzer introduced from afar can quickly and accurately measure the parameters required for plant illumination such as photosynthetic flux density PPFD, photosynthetic radiation (radiation) illumination, and chlorophyll A/B weighted irradiance.

The director of the Agricultural Lighting Committee, Ph.D., and associate professor of Zhejiang University Zhou Yu introduced its application in the field of agricultural lighting from the perspective of LED intelligent control technology. There are usually three ways to design the light source: LED light source and control system design, LED light source and control system design of the incubator, and light source and control system design based on plant factory. Mr. Zhou is based on tobacco growth and microalgae culture test. LED light source control.

Test light source system

Teacher Zhou emphasized that the application of LED in plant tissue culture is promising, and tissue culture is most likely to be marketized in LED agricultural lighting. After adopting plant tissue culture light source and control system, it has improved the utilization rate of tissue culture room and greenhouse space by 60%; reduced energy consumption by more than 60%; reduced maintenance cost of lamps by more than 80%; reduced the use of pesticides; and improved vegetables and traditional Chinese medicines. Many benefits such as quality.

The output value of global LED application plant lighting has been growing rapidly since 2013. The preliminary statistics reached US$100 million in 2014 and is expected to reach US$500 million in 2017. With the increase in the penetration rate of global LED application agricultural lighting, the Chinese market is slowly emerging, and the future market prospect is broad.

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