We all know that the core assembly component of the LED plant growth lamp is the plant lamp lamp beads. The most important thing in a piece of LED plant lamp lamp beads is the light spectrum emitted by the lamp beads, because the spectrum with a large plant utilization rate is only a few bands. If the wavelength is not well controlled, the spectrum emitted by the plant lamp beads is not exactly what the plant needs, which completely violates the fundamentals of using LED products for high efficiency and energy saving.
As far as the lamp beads are concerned, no matter how good the package and patch technology, no matter how large the actual power, the main parameter of spectral control is lost, that is, a piece of waste chip; for the entire table plant lamp, the best heat sink is used , With the best heat-conducting device, the best housing, and the best lens, the spectrum emitted is not what the plant needs. For the plant that needs to fill light, it is just a waste lamp.
Plant lamp lamp bead wavelength control is so important, so what range should the spectrum of LED plant growth lamp choose to control? First, we must understand the effects of various wavelengths on plants and their utilization: (The visible light wavelength distribution is shown in Figure 1)
Spectral wavelength range diagram of plant growth lamp parameters
From germination to maturity, plants have different requirements for light quality, light intensity, and light time (here only light quality, namely the wavelength and spectrum of light), but in general, the most demanded plant is red Light and blue light, the demand of various light by plants and the effect of various light on plants: (Figure 2)
The effect of LED plant lights on plants in various spectral bands
It can be seen from Figure 1 and Figure 2 that the red and orange light demand of plants is the largest, which mainly affects the flowering and fruit of plants, followed by blue light, which mainly affects the growth of plant rhizomes. The demand for other spectrums is very small. Therefore, the wavelength range of LED plant lamp beads The choice of control design is mainly based on red and blue light.
Some people may ask, can't the wavelength of LED plant lights be customized, so if the wavelength of red light at 680nm has the greatest effect on plants, can plants only emit red light at 680nm? Unfortunately, the answer is that it is not possible at present. At present, there is no light wave emitted by any light source that can accurately control a certain fixed wavelength and reach and act on the object. Therefore, the light skin test reports we usually see are all It is an undulating curve, not just one point (Figure 3).
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