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White LED plant lights are not conducive to plant growth?
- Sep 10, 2018 -

The plant lights are made in a combination of red and blue, all blue, and all red, to provide red and blue wavelengths of light, covering the wavelength range required for photosynthesis. In terms of visual effects, the red and blue combination of plant lights is pink. The white light LED plant lamp, the most common is to use the blue core to stimulate the yellow phosphor, which combines to produce a visual white light effect. In the energy distribution, there are two peaks in the blue region of 445 nm and the yellow-green region of 550 nm. The 610-720nm red light required by plants is very scarce. This explains why plant growth is unfavorable under the illumination of white LED plant lights.


Experts from an agricultural university have developed a batch of wintergreen seedlings through cloning technology, and based on their growth status under different color light sources, they are looking for the "nutritive light" that is most suitable for plant growth. Remember to see that the holly seedlings in purple light are the tallest, but the leaves are small, the roots are shallow, and a malnutrition looks like. The seedlings under the yellow light are not only short, but the leaves look lifeless. The holly growing under the mixed light of red and blue is the best, not only strong, but also very developed. According to reports, the red and blue bulbs of this light source are configured in a ratio of 5-6:1. In addition to the holly seedlings, experts also used the phalaenopsis, manxin orchid, strawberry, and tomato for the light test. The results demonstrate that a 5-6:1 red-blue LED plant light is most beneficial for plant growth.



At the 2016 Tokyo exhibition, three different light-colored plants were displayed. The seedlings of the same size were irradiated with a red LED having a wavelength of 630 nm, a blue LED of 430 nm, and a pink color formed by a combination of a red LED and a blue LED. After 3 weeks, the growth of the seedlings was compared. The results show that pink light illumination is most helpful in promoting plant growth. Plant growth does not require all wavelengths in the visible light, but only absorbs light of a specific wavelength. For example, when plants are photosynthesizing and flowering, the absorption peak of chlorophyll - red light near 660 nm can promote growth. When the flower is formed, blue light near 450 nm can promote growth. The seedlings irradiated by three different light colors were compared, and the seedlings irradiated with the red LED plant lamp grew the slowest and the smallest overall. Seedlings irradiated with blue LEDs have fewer leaves and are generally slender. The seedlings irradiated with pink LED plant lights have larger leaves and a balanced growth of the whole plant.