The energy distribution of each spectrum has different effects on plants. For plant morphology, growth and development, from ultraviolet to far-red light has an effect. Among them, red light (600-700 nm), blue light (400-500 nm), ultraviolet light (wavelength <400 nm), and far-red light (700-800 nm) have a relatively large impact on plant growth and nutritional quality. The red light and blue light of LED grow lights play an important role in the formation and growth of sprouts, while LED ultraviolet light improves the quality of sprouts.
Adding 24% green light (500-600 nm) to the red and blue LED grow lights can promote lettuce growth and dry matter accumulation. The fresh weight and dry weight data of red bean sprouts R:B=8:1, R:B=2:1 and R:G:B=6:2:1 show that they have increased compared with white light, where R:G: B=6:2:1 has the most obvious growth, indicating that the combination of red, blue and green light quality of LED grow lights is beneficial to the dry matter accumulation of sprouts, and the addition of green light can promote the accumulation of dry matter of red bean sprouts. Compared with white light, the red light of the LED grow light significantly increases the elongation of the hypocotyl of the pea seedling, while the blue light of the LED grow light has a significant inhibitory effect. R:B=8:1 red bean sprout seedling vegetable has the longest hypocotyl, R:B=2:1 is the shortest. It shows that R:B=8:1 with a large red light ratio of LED grow lights has the best effect on promoting hypocotyl elongation of red bean sprouts, while R:B=2:1 with a large blue light ratio of LED grow lights inhibits hypocotyl elongation. The long-term effect is obvious.
The soluble sugar content of toona sinensis seedlings treated with LED grow light blue light was significantly lower than that with white light treatment. In this experiment, the LED grow lights were treated with blue light, and the soluble sugar content was lower than that of the white light control group. The blue light induced the increase in the expression and activity of antioxidant enzyme genes. The R:B=2:1 treatment has the highest soluble protein content, indicating that the larger blue light ratio R:B=2:1 has the least degradation effect on the soluble protein content. The red and blue light treatments significantly increased the VC content in the leaves of pea seedlings, but the difference between red and blue light quality had no effect. The VC content of red bean sprouts in each treatment was significantly higher than that of the control, indicating that the red and blue light quality significantly accumulates the VC content of red bean sprouts. effect.
LED grow lights control photoperiod
Plants, like humans, also need time to rest. Long-term supplementary light does not have a good effect on the growth of plants. Plants are just like people’s work and rest time. This is the photoperiod of plants.
If it is not affected by people in the natural environment, then each plant adapts to the natural environment to form its own photoperiod and survives in this uncontrollable natural environment. But if it is an artificial cultivation environment with LED grow lights, we can control the photoperiod of plants by adjusting the spectrum of LED grow lights.
LED grow lights control light intensity
The light intensity will affect plant cell proliferation and the differentiation of seedlings, buds and roots, and indirectly affect the growth of plants. Different light intensities correspond to the various stages of plant growth. In the early stage of plant growth, too much light is not required to meet the growth of plants. As the plant grows, the light intensity should be increased appropriately. When the plant blooms and bears fruit, LED grow lighting directly affects the flowering period and fruit setting rate, and also determines the yield and quality of the plant.
LED grow lights control light quality
The quality of LED grow light is mainly the choice of lamp beads. LED grow lights generally have red light beads, blue light beads, white light beads and full-spectrum lamp beads. Numerous experiments by scientists have proved that the light needed for plant growth is red light. As with blue light, most users choose red and blue light beads, but there are not only plants that need red and blue light, so when choosing light beads, you need to customize the light beads according to the light quality required for the growth of the plant.
LED grow light application advantages:
1. The LED grow light can be well used in tissue culture and can be used for close-range lighting, especially with LED plant light strips;
2. The wavelength of the LED grow light can be customized, which can replace 3-5 times the power of high-pressure sodium lamps, halogen lamps, and fluorescent lamps, saving power by 80%;
3. The LED grow light has a long life span, up to 50,000 hours;
4. LED grow lights can be freely matched with the ratio of lamp beads to meet the needs of different plants and different growth stages;
5. The use of led plant growth lights can control the growth rate of plants and predict the maturity time of the market;
6. LED grow light is a kind of energy-saving, environmentally friendly and efficient plant growth light.
7. The heat emitted by LED grow lights is much lower than that of traditional plant growth lights.
8. LED grow lights respond faster than traditional plant growth lights;
9. LED grow lights are stronger than traditional plant growth lights.
The effect of LED grow light quality on the photosynthetic characteristics of plants, LED grow light has a regulatory effect on the synthesis of chlorophyll, leaves under red light have a higher chlorophyll content and a lower ratio of chlorophyll a and chlorophyll b. The values of chlorophyll a and chlorophyll b are extremely high under blue light, so more blue light is used to supplement light for plants that like light. On the contrary, the effect of red light on plants that like light is more obvious.
