Effect of spectral range on Plant Physiology

·280~315nm–& ndash;> This wavelength belongs to ultraviolet light, which has the function of directly suppressing the growth of all kinds of animals, plants and even fungi, and has little impact on morphological and physiological processes.
·315~400nm–& ndash;> This kind of light wave also belongs to far ultraviolet light. Although it does not damage plants by ultraviolet light, it has no direct effect on plant growth. Chlorophyll absorption is less, which affects the photoperiodic effect and prevents stem elongation.
LED GROW LIGHTS

·400~520nm (blue) – > Such wavelengths can directly develop the roots and stems of plants, and have the largest absorption ratio of chlorophyll and carotenoids, and have the greatest impact on photosynthesis.
·520~610nm (green) – > Green plants repel pushing, and the absorption rate of green elements is not high.
·610~720nm (red) – > The chlorophyll absorption rate of plants is not high, but this wavelength has a significant impact on Photosynthesis and plant growth rate.
LED STREET/AREA LIGHTS

·720~1000nm–& ndash;> Such wavelengths are generally infrared wavelengths, which have a low absorption rate for plants, can directly stimulate cell elongation, and will affect flowering and seed germination.
·>1000nm–& ndash;> The wavelength of laser light has been converted into heat.
From the above plant and spectral data, the influence of light of each wavelength on plant photosynthesis is different. Among the light required by plants for photosynthesis, 400 ~ 520nm (blue) light and 610 ~ 720nm (red) light contribute the most to photosynthesis, while 520 ~ 610nm (green) light has a low efficiency ratio for plants to exercise growth.
According to the above principle, plants only have the effect of directly helping the growth of the spectrum of 400 ~ 520nm (blue) and 610 ~ 720nm (red), so the plant lamps under the academic concept are made into three forms: red blue combination, all blue and all red, so as to provide light lines with two wavelengths of red and blue, which are used to cover the wavelength range required for photosynthesis of plants.
LED FLOOD/TUNNEL LIGHTS

In terms of visual effect, the LED plant growth lamp with red and blue combination presents pink. This mixed light color is extremely uncomfortable for biological lighting, but it can only be used for practical purposes.
General white LED beads, the most common is to use a blue core to excite yellow phosphor to emit light, so as to compound to produce a visual white light effect. In the energy distribution on the integrating sphere test report, there are two peaks in the blue region of 445nm and the yellow green region of 550nm.
However, the 610 ~ 720nm red light required by plants is less covered, which is unable to supply light and the light efficiency required for their planting plants. This explains why under the irradiation of white LED, the growth speed and harvest effect of plants are not as good as those of ordinary outdoor planting.
Using the above data, the chromatographic ratio of red and blue lamp of general plant lamp is generally between 5:1 ~ 10:1, and the ratio of 7 ~ 9:1 is usually optional. Only the proportion distribution requires the brightness ratio of lamp beads as the basis for light mixing, and the number of non lamp beads as the basis for light mixing.


Post time: Aug-02-2022