The color temperature and lumen of biological light source and artificial light source are seen from the eyes of organisms, and the demand of plants for light is photosynthesis. LED lamp is an electroluminescent semiconductor material chip, which is solidified on the bracket with silver glue or white glue, then connected to the chip and circuit board with silver wire or gold wire, and sealed with epoxy resin around to protect the internal core wire, and finally installed the shell, so the LED lamp has good seismic performance. LED can directly emit red, yellow, blue, green, green, orange, purple and white light. LED lamp manufacturers are environmentally friendly, and there are no harmful substances of mercury. The assembly parts of LED bulb can be easily disassembled, and can be recycled by others without recycling by the manufacturer. No strobe. Pure DC operation eliminates the visual fatigue caused by the stroboscopic of traditional light source. Reduce line loss, no pollution to power grid. Power factor ≥ 0.9, harmonic distortion ≤ 20%. EMI meets the global indicators, reducing the power loss of power supply lines and avoiding the high-frequency interference pollution to the power grid.
The LED light bar can save energy significantly. Using super bright high-power LED light source and high efficiency power supply, it can save more than 80% power than traditional incandescent lamp, and the brightness is 10 times of incandescent lamp under the same power. The super long life is more than 50000 hours, which is more than 50 times of the traditional tungsten lamp. Led adopts high reliable advanced packaging technology eutectic welding to fully guarantee the long life of LED. The luminous visual efficiency can be as high as 80lm / W, a variety of LED color temperature optional, high color rendering index, good color rendering. This is not because the color and lumen are determined by the radiation value. The influence of spectral range on plant physiology is 280 ~ 315 nm. The wavelength is UV light, which can directly inhibit the growth of various animals and plants and even fungi. It has little effect on morphology and physiological process. Although the 15-400 nm light wave has no UV damage to plants, it also belongs to far UV. In order to have no direct impact on plant growth, the absorption of chlorophyll is less, affecting the photoperiod effect and preventing stem elongation. The wavelength is in the range of 400-520nm (blue), which can directly promote the development of plant roots and stems. The absorption ratio of chlorophyll and carotenoid is the largest, and the effect on photosynthesis is the largest. 520 ~ 610 nm (green) green plant repellent, green pigment absorption rate is not high. The chlorophyll absorption coefficient of 6 plants at 10-720 nm (red) was not high, but it had significant effect on Photosynthesis and plant growth rate. The wavelength is 720 ~ 1000 nm, which belongs to the infrared band. The absorption rate of the plant is low, and it can directly stimulate the extension of cells, thus affecting the flowering and seed germination. More than 1000 nm, close to the laser wavelength, and has been converted to heat.
According to the above plant spectral data, different wavelengths of light have different effects on plant photosynthesis. Among the light needed for plant photosynthesis, 400-520 nm (blue) light. 610-720 nm (red light) contributes the most to photosynthesis, while 520-610 nm (green light) has little effect on plant growth. If according to the above principle, plants only have a direct impact on the spectral growth of 400-520 nm (blue) and 610-720 nm (red), the plant lights under the theoretical concept can be divided into three forms: red blue light, all blue light and all red light. It provides two wavelengths of light, red and blue, to cover the range of wavelengths required for photosynthesis of plants. In terms of visual effect, the combination of red and blue LED lights is pink. This mixed color brings great inconvenience to the color system of biolighting, but it can only be selected carefully in practice, mainly for its practicality.
General LED white beads, the most common is the use of blue core, excitation of yellow phosphor light, produce visual white effect. There are two peaks in the blue region of 445 nm and the yellow green region of 550 nm. However, the 610 ~ 720 nm red light needed by plants does not provide the light efficiency of plants with less coverage. This explains why the growth speed and harvest effect of plants under white LED irradiation are not as good as that of ordinary outdoor planting. According to the above data, the chromatogram ratio of red and blue lamps of general plant lamps is generally between 5:1 and 10:1, and the ratio of 7:9:1 can be generally selected, but the brightness ratio of lamp beads should be taken as the basis for mixing light, and the number of non mineral lamp beads is the basis for mixing light.