LED lighting in the greenhouse is the world working on a strong march to replace conventional energy-hungry light bulbs growth. Per watt recorded exudes a LED lamp relatively more (visible) light. The still widely used grow lights in greenhouses are HPS / SON (high pressure sodium) lamps. In an HPS / SON-lamp is converted only about 20% of the energy into light, the rest is similar to a light bulb is lost as heat. In a LED grow lamp is as high as 90% of the energy converted into light.
LED lighting was introduced only in 2008 in horticulture, taking as a starting point force can achieve better energy efficiency, preventing light nuisance for local residents and the nature and administer only light with a color which the maximum plant photosynthesis. Since then, much research and the quality is greatly improved as well as the cultivation methods.
Much research has been done on exposure and how the plant develops at the different colors of light. Plants grow normally under the very broad spectrum of the sun, but use the light only partially. It is generally known that the photosynthesis of a plant takes place at wavelengths between 400 and 700 nm, expressed in the 'plant action spectrum'. Photosynthesis enters the plant action spectrum is best achieved around 640 nm (red light).
light spectrum
The amount of growth light is expressed in micromoles / m 2 / s. The "far red" light (700-780 nm) and infrared light (> 780 nm) is outside the visible spectrum, and indeed does not contribute directly to photosynthesis, but the plant absorbs it or causing warming plant parts. In other words, the leaf temperature is very important.
Ledspectrum
In addition, it is unknown what the effect of the shifting of the offered spectrum of an HPS / Son-T with respect to an LED illumination with 90% red and 10% blue light (previous studies have shown that with 100% red light can not grow and that a minimum of blue light could offset the worst deficiencies). For example, there is almost no light administered between 500 and 600 nm (green-yellow) and light between 700 and 780 nm (far-red light). There is relatively much research into the effectiveness of color on photosynthesis, but less on the effect of light on color control processes in the plant. Think of thrust of the plant, etc. With regard to the photosynthesis has been demonstrated that red and blue LEDs are sufficient, however, not enough is known about the correct spectrum of the control processes.
Temperature
Growers have to conclude that with only red and blue LED production 20% lower than at Son-T. This was because the crop under LED by the lack of infrared radiation (heat) had a reduced development rate. This is, of course, especially applicable in cold winters. The temperature of the plant as a whole directly influences the growth, too low or too high a temperature can cause a surplus or shortage of assimilates. Under normal conditions is true that a temperature rise of a plant causes increased activity of enzymes.
UV
The so-called UV-B (300-315 nm) and the UV-A (315-400 nm) are responsible for degradation of cells. UV, in particular, has influence on the coloration of photomorphogenesis and plants. A limited portion of the UV is also used for the photosynthesis and growth of plants.
Infra-red
Near infrared (> 700 nm) is the part of the spectrum which is rarely used by the plants; it is mostly converted into heat. The radiation-section of 700 to 800 nm is known as' far-red. " This contributes to the photomorphogenesis, especially the stem elongation and the photoperiodic ism of plants.
Day length and light / dark cycles
Day length is important for all photoperiodic plant processes. A rule of thumb is that at day lengths of more than 14 hours, the effect of the light on the growth and production decreases the last hours. On a long day go more sugars in the leaves. A short day stimulates the generative growth; the inflorescence is rather than constructed. As the day lasts longer than 17 hours, the risk of chlorosis, anomalies, reduced growth and production increasing. Phytochrome can be compared to the movement of a crop, the so-called circadian clock (biological clock). The beginning of the night is the 'reset'.
Relationship light, photosynthesis, growth and development
Theoretically, a plant can use all the photons having wavelengths between 400 and 700 nm for photosynthesis, but the efficiency with which this happens is not equal. The amounts of chlorophyll encarotenoiden in a leaf are dependent on the quality of light in which the blade has been able to develop. In addition to chlorophyll leaf also contains other pigments, i.a. carotene with absorption spectra in the blue-green part. This is stipulated in part genetic but is also controlled by light. The composition of light is of influence on the development of the plant.
Ability of the LED grow light as additional lighting
It is recommended a capacity of 100W (200W better) per 25 m2 on a lamp height of 3 meters. More power increases your revenue.
Color Ratio
Each plant needs its own LED color in the right proportion. Ask for information on the best grow light for your plants.
Quantity discounts for gardeners
The prices shown in the shop are for small quantities. You can apply a very competitive quote for larger numbers.
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