1. Different wavelengths of luminescence spectrum
Plant growth lights are mainly red and blue components in the visible light spectrum, while ordinary lights are just light-emitting diodes, and the spectrum is concentrated in the green light part.
LEDs used in the field of plant cultivation also show the following characteristics: rich in wavelength types, which exactly match the spectral range of plant photosynthesis and photomorphology; the half-width of the spectral wave is narrow, and pure monochromatic light and composite spectrum can be obtained by combining as required; it can be concentrated Light of a specific wavelength illuminates the crop evenly; it not only regulates the flowering and fruiting of the crop.
It can also control plant height and plant nutrients; the system generates less heat and occupies less space, and can be used in a multi-layer cultivation three-dimensional combination system to achieve low heat load and miniaturization of production space; in addition, its strong durability also reduces. Operating costs.
2. External differences
LED is also called light-emitting diode. The core part is a wafer composed of P-type semiconductor and N-type semiconductor. There is a transition layer between P-type semiconductor and N-type semiconductor, which is called P-N junction. When the current flows from the anode to the cathode of the LED, the semiconductor crystal will emit light of different colors from purple to red, and the intensity of the light is related to the current.
According to the luminous intensity and working current, it can be divided into ordinary brightness (luminous intensity < 10mcd), high brightness (luminous intensity of 10~100mcd) and ultra-high brightness (luminous intensity > 100mcd) and other types. Its structure is mainly divided into four parts: the structure of the light distribution system, the structure of the heat dissipation system, the driving circuit and the mechanical/protective structure.
Research on LEDs as supplementary lighting for plant photosynthesis Traditional artificial light sources generate too much heat, such as LED supplementary lighting and hydroponic systems, air can be recycled, and excess heat and water can be removed.
Electrical energy can be efficiently converted into effective photosynthetic radiation and ultimately into plant matter. Studies have shown that with LED lighting, the growth rate and photosynthetic rate of lettuce are increased by more than 20%, and it is feasible to use LEDs in plant factories.
3. Different uses
LED lamps can replace spiral incandescent lamps or energy-saving light bulbs, ranging from 5-40 watts, low-power incandescent lamps, to 60 watts (only need about 7 watts of electricity).
LED grow lights can help shorten the growth cycle of plants, because the light source of this light is mainly composed of red and blue light sources, using the most sensitive light bands for plants, red light wavelengths use 620-630nm and 640-660nm, blue light wavelengths use 450-460nm and 460-470nm.
These light sources enable plants to produce the best photosynthesis, and the plants get the best growth state. Experiments and practical applications have shown that, in addition to providing supplementary light to plants during the lack of light, they also allow plants to promote multiple hair growth during the growth process. The differentiation of side shoots and buds accelerates the growth of rhizomes and leaves, accelerates the synthesis of plant carbohydrates and vitamins, and shortens the growth cycle.
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