How much do you know about Plant Indoor Grow Lights Nov 12 , 2021

Plant growth lamps are artificial light sources, usually electric light sources, designed to stimulate plant growth by emitting an electromagnetic spectrum suitable for photosynthesis. Plant lights are used in applications that do not have natural light or need supplemental light. For example: in winter, when the possible daylight time may not be enough to achieve the desired plant growth, lights are used to extend the time the plants receive light. If the plants do not get enough light, they will grow in length.

Today we are going to understand the benefits of using LED plant lights for indoor agriculture. From the two main factors of light, color and power, we will understand how plant growth lights can maximize yield.

Color

As we mentioned before, plants are very picky about the type of light they absorb. Indoor grow lights provide them with the best red and blue wavelengths, making them grow big, healthy and strong. But why especially red and blue?


Outdoors, red light is most abundant in summer. When plants use led plant grow lights to perceive more red light, they release a hormone that prevents the breakdown of chlorophyll. This allows plants to take full advantage of the abundant sunlight in spring and summer. For this reason, red light produces large and healthy plants because chlorophyll is converting a lot of light into cellulose. In addition, red light is needed for the growth of flowers and seeds/fruits. Remember-like all other good things, too much red light can cause serious problems, namely lanky and slender plants.
Although red light is more common in spring and summer, higher levels of blue light occur in autumn and winter. The blue light receptor of the plant triggers a hormonal response, and when it senses higher levels of blue light, it slows down the growth of the stems and leaves. For this reason, the initial reaction was not to use blue grow lights, but some blue is important. The same blue light hormone controls the "top dominance" of plants, which is why the main stem of the plant is larger than any lateral stem. It is often seen that more exposure of plants to blue light will produce short, dense plants with more complex stem structures. However, too much blue light can cause poor plant growth.
Most indoor growers recommend a 5:1 ratio of red and blue to get the best of both worlds. The high intensity of red light keeps the plant in the best growth mode, while a small amount of blue light promotes the growth of the stem.

Strength (Power)
For example, Watt is the power metric that everyone is probably most familiar with. However, when it comes to the physics of plant growth, it is more or less a useless measurement. This is because Watt describes the power consumed by the light source, not the power it emits. Therefore, although it is helpful to know the wattage of the grow light, the measurement has little to do with the plant itself.

If you hear the discussion about lumens, you are closer to understanding the power of grow lights. Lumen measures light based on how humans perceive light. We have so-called "clear vision", that is, our vision and color perception under sufficient light conditions. Lumens are plotted on the photopic response curve (shown above) and measure the light that humans and animals can see. As you can see, this range is mainly green light, with very few red or blue parts of the spectrum. Although calculations using lumens, such as LUX (lumens/square meter) or foot candle meters (lumens/ft2), are a useful measurement method for understanding humans, they also tell us almost nothing about plants. On the one hand, plants will not absorb most of the green light that dominates the lumen curve. In addition, you may use red and blue grow lights in your farm, and their lumens will not be very high. For these reasons, you should avoid using lumens to measure the power of dimmable greenhouse LED grow lights.

You should use the photosynthetic photon flux density (PPFD) to measure the power of the growth lamp. Before we delve into the advantages of PPFD, we need to understand what it measures. PPFD is a measure of photosynthetically active radiation, referred to as PAR. PAR is not a measure of anything itself, but more description. PAR light is all visible light wavelengths that cause photosynthesis and is found in the 400-700 nanometer range. PPFD is a "point" measurement that tells you how many photons from the PAR range hit a specific area of the tree canopy over time. It is expressed as the number of micromoles per square meter per second (μmol/m2/s). Therefore, PPFD is the most accurate optical power measurement method. First, unlike other measures, it considers the entire spectrum seen by plants. PPFD also considers the amount of light that actually reaches the plant, rather than just focusing on the origin. The light source can be very bright and powerful, but if it is too far away from the plant, or blocked in some way, the plant will not get all the light needed for photosynthesis. PPFD controls this inaccuracy.

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