As we all know, light is one of the basic factors of plant growth and development. Light quality has a regulatory effect on plant growth, morphogenesis, photosynthesis, material metabolism and gene expression. Controlling plant morphogenesis and growth through light quality regulation is an important technology in the field of modern cultivation.
In general, common fluorescent lamps, metal halide lamps, high pressure sodium lamps, and incandescent lamps are widely used in traditional plant facility cultivation. However, these light sources actually have little effect on plant growth. As a fourth-generation new type of illumination source, LED has energy saving, safety, reliability, long service life, short response time, small size, light weight, low heat generation and easy Diversified or combined control and many other important features different from other electric light sources.
Compared to traditional light sources, LEDs have the following characteristics:
(1) The spectral performance is good, and pure monochromatic light and composite spectrum can be obtained as needed, and the spectral width is less than ±30 nm, and the wavelength coincides with the spectral range of plant photosynthetic and photomorphological formation;
(2) The effective utilization rate of light energy can reach 80% to 90%, and can achieve separate control of different light quality and luminous intensity;
(3) As a cold light source, plants can be irradiated at a close distance, greatly improving the utilization efficiency of space, and can be used for a multi-layer cultivation stereoscopic combination system, realizing low heat load and miniaturization of production space;
(4) LED is resistant to impact, not easy to break, contains no mercury, no pollution, waste can be recycled, the service life is dozens of times of ordinary light source, and the extra durability also reduces operating costs.
Due to these remarkable features, LED has become the preferred source of light for plant cultivation, and is commonly used in plant cultivation in controlled facility environments, such as plant tissue culture, facility horticulture and lock-up plant plants, and aerospace ecological life insurance systems. Of course, LED also has its disadvantages - that is, the price is higher. Therefore, there is a need to have a process in the field of plant cultivation. It is believed that in the near future, with the development of social science and technology, LED will be widely used in plants. Facility cultivation field.