Light quality is the spectral composition of the light to which a plant is exposed. Each spectral energy distribution has a different effect on the plant. For plant morphogenesis and growth and development, it ranges from ultraviolet to far-red light. It has a relatively large impact on plant growth and development and nutritional quality.
LED plant light blue light
LED plant lights blue light is very important. Without blue light, most plants will not grow properly. Thereareseveral different ways to measure LED Plant Light Blue Light for plants, each with its own effect. When you see a plant growing in the direction of the light, it is only responding to the LED plant light blue light. Without any blue light component, the plant will not know where to grow towards.
LED plant light blue light also affects the way stems and leaves grow, plant seedlings and plants that emit LED plant light blue light exposure tend to be shorter and stronger, they tend to grow large leaves and spread out.
Together with red light, LED Botanical Lights blue light can help plants "know" whether it's day or night, and help set circadian rhythms. Cannabis plants begin to droop every day before the LED plant lights go out, and they begin to stretch when the LED plant lights come on. This is a way for the plant to conserve energy while it "sleeps". Since the blue colour in the LED plant light helps to "understand" the schedule, it will maximise preparation for when the lights go out and when the lights come on.
Red Light in LED Plant Lights
We can certainly see red light, but generally humans cannot see far-red light, but plants can perceive red and far-red light.
Red light is probably the type of light that plants need the most, and when it comes to photosynthesis, plants are best able to produce energy from red light. In fact, even if they only get pure red light, many plants can actually grow, although they won't be as large and healthy as they would be in full spectrum light. Every type of growth light, even light that is blue-rich like metal halides, can provide a considerable amount of red light.
After the seed breaks, the shell opens, but before the shell reaches the surface, the roots descend and the seed grows in the direction of the higher red light compared to the far red. Blue light does not usually cause its roots to go deep into the ground, but the seed can sense red from the surface and grow in that direction.
After the seed reaches the surface and is exposed to blue light, it will stop acting like a root and start acting like a seedling, opening its leaves and growing towards the closest blue light source. If it doesn't get enough blue light at the surface, it will continue to grow longer and longer on the main stem without leaving any leaves behind, behaving more like a root grower because it still "thinks" it is underground, at least hidden from the sun.
The seed moves towards the light, and once the plant hits the surface, the leaves inside won't open ...... It is looking for the right amount of light of the right colour! If the plant can't get enough light from the surface, it will stay in "root mode" and stay higher without opening its leaves.
Cannabis plants tend to be relatively short in bright sunlight because direct sunlight usually has more red colour than far red, and the plant responds to this ratio. Thus, if the plant gets more 660nm than 730nm light, the stems tend to be shorter and the plant will grow many nodes with shorter stems.
If the plant gets more 730nm light than 660nm, it tends to grow tall and flexible. When a plant is surrounded by a lot of vegetation, the surrounding foliage absorbs a lot of red light, so whatever light filters down to the hidden plant or stem has a higher percentage of far-red.
With a high level of far-red light response, the stems will begin to elongate and grow taller, as the plant is stretching "towards" the light, until it increases its ratio of red to red and "feels" that it is in direct sunlight again. If the plant is surrounded by greenery, it will begin to sense a higher proportion of far-red light and begin to "stretch" upwards until it passes over other vegetation and receives better quality light.
Far-red light is the last thing the plant "sees" at sunset, so when far-red light levels are accompanied by a period of darkness, the plant "knows" it is nighttime. When the plant starts to get higher levels of red and blue light from the morning sun, it "knows" that the day has begun again. If the plant is exposed to red light during periods of darkness, it will be "woken up" because it thinks that daytime is happening. Blue light also affects plants by disrupting their circadian rhythms.
These processes help greenhouse farms set their own internal clocks for the plants, and tracking the time of night is the main way cannabis plants know when to start flowering (budding). When the nights get longer, it sends out a flowering response because it "thinks" winter is coming! Therefore, growers can force the plant to start flowering at any time by simply changing the plant's light schedule!
LED Plant Light Green
There has been a lot of research on how the different light spectrums affect plant growth, especially in the last decade as NASA researchers have tried to find a way to use LED plant lights to most effectively grow plants in space.
We've known for a long time that plants need at least red and blue light to grow properly, but recent discoveries have found that green light, while not the most effective spectrum for photosynthesis, also has a significant impact on plant growth.LED plant light green light has been shown to be associated with seedling and growth stages as well as the onset of bloom, CO2 / water use, stem growth and overall plant height. What we don't know yet may be more.
But like the rest of the spectrum, plants seem to need just the right amount of green light for optimal growth, not too much or not enough. After several experiments with green light, NASA's Bioscience Research Group reported that light sources composed primarily of green slowed plant growth. A combination of red and blue (including up to 24% green) actually enhanced the growth of some plants over pure red and blue light.
Cannabis is definitely different from lettuce, which doesn't necessarily mean that adding a green light component will increase cannabis production! Almost all LED plant lights offer a certain percentage of green light content, and adding too much green may reduce yields. To explore greater growth efficiency from green lighting.
UV light
When we talk about plants, UV-A (315 to 400 nm) and UV-B (280 to 315 nm) are sometimes categorised as part of the 'blue' spectrum, although in recent years, the UV spectrum has been found to have a unique effect on plants in some studies.
Plants exposed to high intensity UV light can also be damaged, and we have learned that plants respond to UV light by making chemicals, antioxidants and enzymes that help prevent and repair damage. They are making their own "sunscreen!" It's kind of like how our bodies tan us after UV exposure to protect us from further skin damage.
Some growers believe that providing UV-B light to plants may increase THC levels or other aspects of cannabis bud potency. This is possible because we know that UV-B light does change the way the plant grows. But we don't know exactly how cannabis responds to UV-B. It may increase THC levels, but it's also possible that it may decrease it, or not affect THC at all.Since we have so little information today, it's hard to know if supplementing cannabis with additional UV-B is truly beneficial.
Most LED plant lights also produce some amount of UV-B, though far less than the sun. The only exceptions are LED plant lights with a narrow band spectrum that require a specially installed UV diode. There are other UV light sources.
The effect of LED plant light quality on the growth of crop roots, light can pass through the internal light environment, through the regulation of photoreceptors, and regulate their growth and development.LED plant light blue light favours the growth and development of plant roots. With LED plant light blue light irradiation cultivated rice seedlings, found that the rice seedlings root system accumulates high protein content of non-protein nitrogen content is low, protein nitrogen total nitrogen ratio is high, the total nitrogen is also high, thus indicating that the LED plant light blue light can improve the root system of rice seedlings nitride synthesis, production of protein in the root system to accumulate. With the crop root system of LED plant light blue light effect as the theoretical basis of seedling has been re-producers began to apply.
LED plant light quality effect on leaf growth, leaf is the main organ of plant photosynthesis, LED plant light quality changes directly affect leaf growth. Birch seedlings growing under blue light leaf area is 2 times the area of seedlings under red light, its leaf epidermal cell area, fenestrated tissue, spongy tissue and functional chloroplast area are larger than under white light and red light. The study also showed that increasing the proportion of LED red light in the composite light has a certain promotion effect on the increase of tobacco leaf area, but the leaf weight of the leaf blade is reduced, the leaf blade becomes very thin.
LED plant light plant light quality on stomatal apparatus regulation, stomata are the channel for water and oxygen in and out, is the gateway to plant photosynthesis. Stomatal movement is regulated by many external environmental factors and internal factors, of which light is an important regulatory factor. In monocotyledonous and dicotyledonous plants are found, LED plant light blue light can promote the opening of stomata, LED plant light blue light prompted stomata often open principle, that is, blue light activation of the plasma membrane ATPase constantly pumping out protons, the formation of transmembrane electrochemical gradient, LED plant light plant light stomatal opening.
LED plant lights plant light quality on crop stem growth, different wavelengths of light can be achieved by affecting the endogenous hormone levels in the plant body to achieve the growth regulation of the stem. Blue-violet light can increase the activity of indoleacetic acid oxidase and reduce the level of growth hormone, thus inhibiting plant growth. At the molecular structure level, red light promotes cell elongation, while blue light has the opposite effect. Overall, long wavelength LED plant light red light promotes stem elongation, while short wavelength light inhibits stem elongation.
The effect of LED plant light quality on the photosynthetic properties of plants has a regulatory effect on chlorophyll synthesis. According to the needs of planting plants for light quality ratio supplemental light, to give plants a better growth state.
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