At any time of the day can enhance the grow lights, you can extend the effective lighting time, both in the evening or night, can take care of light needed to effectively extend and control of plant science for plant cultivation in the field of LED grow ights also showed the following characteristics: rich wavelength, coinciding with the plant photosynthesis and photomorphogenesis spectral range anastomosis; half wave width spectrum width, can obtain pure monochromatic light and complex spectrum, in accordance with the needs of combination; can focus on the specific wavelength of light irradiation and balanced crop; not only can adjust crop blossom and seed setting, but also control the plant nutrient and high plant system; less heat, small occupied space, can be used for multilayer stereo cultivation the combined system, realizes the miniaturization and low load production space; in addition, the strong durability but also reduces the operation cost. Due to these remarkable characteristics, LED is very suitable for plant cultivation in controlled facilities, such as plant tissue culture, Facilities Horticulture and plant nursery and space ecological health protection system.
The development of facility horticulture is rapid, and the lighting technology has been attached importance to the plant growth. Facilities Horticulture lighting technology is mainly used in two aspects: the amount of sunshine as a supplement to the plant's photosynthesis, and the illumination of the plant's light cycle and light form, as the light cycle of the plant, and the LED as a supplementary illumination of the plant's photosynthesis.Traditional artificial light source to generate too much heat, adding LED lighting and hydroponic systems such as the use of air to be recycled and too much heat and moisture can be removed, power can be efficiently transformed for the effective optical radiation, eventually transformed into a plant material.
The research shows that the growth rate of lettuce and the rate of photosynthesis of lettuce are increased by LED high bay, and the LED is feasible for the plant. It was found that the LED light source of the mixed wavelength can significantly promote the growth and development of spinach, radish and lettuce, and increase the biomass accumulation of beet and Mao Genzhong, and the highest sugar and starch accumulation in Mao Genzhong. Compared with the metal halide lamp, in line with the LED wavelength of pepper, basil plant growth, significant changes in the morphology of anatomy of the stems, leaves and with improved optical density, plant light photosynthetic rate raise. Multiple wavelength LED can be caused by two species of marigold and Salvia stomatal number increased,such as plant photoperiod, photomorphogenesis is induced by LED lighting specific wavelength can affect plant flowering time, quality and flowering duration. The number of flower buds and flower number of plants can be increased by LED, and the length of the flower and flowering stage can be controlled by the LED of some wavelengths.
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