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The Design Concept of LED Grow Light

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phlizon grow light

LED Grow Light Contains Lights of Different Colour

UVA/UVB/UV (280nm -- 400nm)

When protecting your skin outdoors, you may be familiar with the terms UV-A/UV-B. We use sunscreen to protect our skin from the sun's ultraviolet rays to prevent skin damage. Too much UV can cause sunburn and even cancer/melanoma in extreme cases!

When we talk about plants, UV-A (315 to 400 nm) and UV-B (280 to 315 nm) are sometimes classified as part of the "blue" spectrum, although in recent years, some studies have found that the ULTRAVIOLET spectrum has its own unique effects on plants.

Like humans, plants exposed to high levels of UV can be damaged, and we know that plants respond to UV by generating chemicals, antioxidants and enzymes that help prevent and repair damage. Basically, they're making their own "sunscreen". It's a bit like how our skin colour turns into black us after uv exposure to protect us from further skin damage.

Some growers believe that providing UV-B light to plants may increase the nutrient levels or other aspects of the potency of plant buds. In theory, this is possible because we know that UV-B light does change the way plants grow. But we don't know exactly how plant responds to UV-B. It may increase some nutrient levels, but it is also possible to lower it or not affect it at all.

Having said that, most grow light also produce a certain amount of ULTRAVIOLET light, though much less than the sun. The only exception is LED grow lights with a narrow band spectrum, which require specialized installation of UV diodes.

Blue light (400 nm -- 500nm)

Blue light is very important. Without blue light, most plants would not grow properly. Plants have several different ways of measuring blue light, each of which has its own effect. For example, when you see a plant growing toward light, it actually only responds to blue light. Without any blue light, plants will not know where to grow.

Blue light also affects the way stems and leaves grow. Seedlings and plants illuminated by grow lights that emit a lot of blue light tend to be short and strong, and they tend to grow large leaves and spread out.

Red light and blue light help plants "know" whether it is day or night and helps set circadian rhythms. You may notice that some plants droop every day when the lights off, and stretch when the lights go out. This is one way plants save energy while they "sleep". The blue light helps the plants set the schedule.

Green light (500 nm -- 600nm)

There has been a lot of research on how different spectra affect plant growth, especially in the past decade, as NASA researchers tried to find a way to make plants grow most efficiently in space using LED grow lights.

It has long been known that plants need at least red and blue light to grow properly, but recent discoveries have found that green light, while not in the most efficient spectrum of photosynthesis, also has an important effect on plant growth. Green light has been shown to be associated with seedling and growing stages and the onset of flowering, the obsorbation of CO2 / water use, stem growth and whole plant height.

Plants seem to need just a bit of green light then could grow optimally. After several experiments with green light, the NASA Bioscience research team reported that light sources composed mainly of green slowed plant growth. But the combination of red and blue (including up to 24 percent green) actually enhanced the growth of certain plants more than only red and blue light.

So we learned that green is very important! In fact, in a NASA experiment with lettuce, only giving plants blue/green/red light produced higher yields than full-spectrum grow light! Almost all growth lamps provide some proportion of green light, and adding too much green can reduce yields. There is a lot of evidence that different plants respond differently to green light, so it is advisable to study different spectra if growing different types of vegetables!

Although the plant can somehow respond to green light, it can't "see" green when it comes to photoperiod and day or night. So you can actually use green light to illuminate plants in the dark without interrupting their dark period at all!

Red and infrared (660 nm and 730nm)

We can certainly see red light, but humans generally can't see infrared light, but plants can sense both red and infrared light.

Red light is probably the most desirable light for plants, which are best able to produce energy from it. 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. Each type of grow light, even blue-rich light like metal halides, can provide a fair amount of red light.

phlizon grow light

How Different Lights Affect Plant Growth

When the seed ruptures, the shell opens, but before the shell reaches the surface, the roots drop, and the seed grows towards the red light. Blue light does not normally help the roots deep into the ground, but the seeds can feel grow towards the red light.

Once the seed reaches the surface and is exposed to blue light, it will start acting like a seedling, opening its leaves and growing toward the closest blue light source. If it doesn't get enough blue light at the surface, it will continue to grow longer and longer main stems without leaving any leaves, behaving more like root growth because it still "thinks" it is underground, at least hidden from the sun. The seeds move toward the light and will not open the leaves until it get enough light of right color! If the plant can't get enough right light from the surface, it will stays in "root mode" and keep growing higher without opening the leaves.

phlizon foldable led grow light

How LED Grow Light Contributes to Indoor Growing

The reason we see red light when the sun is on the horizon is that red light has the longest wavelength and travels the longest distance. At sunset, the light fades quickly, and when all other light is too weak to see, you can still see the Red Cross the horizon and then disappear. This means that for plants, this is the time when the proportion of red light is highest, occurring at sunrise and sunset.

The information contained in lights is important for plant growth because plants needs to "know" whether it is the beginning or the end of the day. Plants can use spectral information to track day and night by sensing when the ratio of red to far-red light is highest.

Infrared light is the last thing plants "see" at sunset, so when far-red light levels are accompanied by a period of darkness, plants "know" it's night. When the plant starts getting higher levels of red and blue from the morning sun, it "knows" the day has started again. If the plant is exposed to red light during the dark period, it will be "woken up" because it thinks daylight 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. Keeping track of the time of night is the main way plants know when to start flowering (budding). When the nights get longer, it emits a flowering response because it "thinks" winter is coming! So growers can simply change the light schedule of their plants and force them to start flowering at any time!

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