· 280-315 nm This wavelength belongs to ultraviolet light. It can directly suppress the growth of animals, plants and even fungi, and has little influence on the morphology and physiological process.

 

 

 

· 315-400 nm This kind of light wave is also far ultraviolet light, although it does not harm plants, and has no direct effect on plant growth, chlorophyll absorption is less, which affects the photoperiod effect and prevents stem elongation.

 

 

 

· 400-520 nm (blue) - This kind of wavelength can directly develop the root and stem parts of plants. It has the greatest proportion of chlorophyll and carotenoid absorption and the greatest influence on photosynthesis.

 

 

· 520 ~ 610 nm (green) - The green plant rejection pushes, the green pigments absorption rate is not high.

 

 

 

· The chlorophyll absorptivity of 610-720 nm (red) - plants is not high, but this wavelength has a significant effect on Photosynthesis and plant growth rate.

 

 

 

· 720 ~ 1000 nm This kind of wavelength belongs to the infrared wavelength. It has low absorption rate for plants and can directly stimulate cell prolongation, which will affect flowering and seed germination.

 

 

 

· Over 1000 nm -"has approached the wavelength of laser light and has been converted into heat.

 

 

 

According to the above plant and spectral data, the effects of light at each wavelength on plant photosynthesis are different. Among the light needed for plant photosynthesis, 400 ~ 520 nm (blue) and 610 ~ 720 nm (red) contribute the most to photosynthesis, while 520 ~ 610 nm (green) light contributes the most to plant photosynthesis. The efficiency ratio of the growth effect is very low.

 

 

 

According to the above principle, plants can only grow at 400-520 nm (blue) and 610-720 nm (red). Therefore, under the academic concept, plant lamps are made into three forms: red-blue combination, all-blue and all-red to provide two wavelengths of red-blue light to cover the photosynthesis needs of plants. Wavelength range.

 

 

 

In terms of visual effect, red and blue LED plant growth lights show pink. This mixed color is very uncomfortable for biological lighting, but it can only be practical and shy of its appearance, mainly to choose its practicality.

 

 

 

Generally white LED beads, the most common use is the blue core, which stimulates the yellow phosphor to emit light, thus compound to produce visual white effect. In the energy distribution of the integral sphere test report, there are two peaks in the blue region at 445 nm and the yellow-green region at 550 nm.

 

 

 

However, the 610-720 nm red light required by plants is less covered than that required by plants for light supply and function. This explains why under white LED irradiation, the growth rate and harvesting effect of plants are not as good as those planted outdoors.

 

 

 

Using the above data, the ratio of red and blue lamp chromatographic in general plant lamp is between 5:1 and 10:1, and the ratio of 7 to 9:1 is usually selected. The ratio of brightness of lighting beads is the basis of mixing light, while the number of non-lighting beads is the basis of mixing light.

 

 

 

When plants are planted with LED plant growth lamp, the height of leaves is about 30-50 centimeters. In this process, different light intensity should be given according to the type of plants planted. Adjusting the height is generally regarded as the simplest way to adjust the brightness.

 

 

 

Industry insiders explained that plant-specific LED lamps are installed in the shelves of large plant factories, which are different from ordinary LED spectra. In order to cooperate with photosynthesis, the spectrum of plant lamps is blue and red, and according to individual needs, they can also be adjusted into cold and warm white light, which is very convenient to operate with the remote control of mobile phone APP. The manufacturer said that the multi-storey shelf plant factory is equipped with water circulation system. After testing, it can grow more than 100 kinds of plants, which is suitable for those who need large-scale production. In addition to household use, plant factories generally have two ways to make profits. One is the large-scale production of leafy vegetables, such as cabbage, cabbage, lettuce and other cruciferous plants. The other is the cultivation of high economic value crops such as ginseng and camphor zhi, which are difficult to grow. As long as specific LED spectrum and control system are used, the harsher growing season can be cultivated. Nourishing crops.