Deep discussion and analysis on LED plant lighting

The vast majority of animals and plants on the earth are inseparable from the sun's rays, but the supply of sunlight is limited and different in different regions and at different times. Avoiding the cycle of illumination, there are still many insufficient light. In the case of artificial light sources, the supplemental light in the growth of animals and plants came into being. In recent years, with the rapid development of red, blue and far-infrared high-power monochrome LED technology , the application of LED in the field of agricultural lighting has attracted wide attention.

The requirements of plants for light are mainly the color of light, spectrum, light intensity and illumination time. Therefore, by artificially developing the illumination of a specific spectral illumination product, plant growth can be greatly improved.

First, what kind of light is more suitable for plant growth?

The effects of different wavelengths of light on plant photosynthesis are different. The wavelength of light required for plant photosynthesis is around 400~720nm.

The light of 400~520nm (blue) has the largest absorption ratio of chlorophyll and carotenoid, which can promote green leaf growth, protein synthesis and fruit formation, so it has the greatest impact on photosynthesis.

Light from 610 to 720 nm (red) promotes plant roots growth, contributes to flowering and prolongs flowering, increases yield, and has a significant effect on photosynthesis and photoperiod effects.

300~440nm (purple light) promotes the formation of pigments and the absorption of phosphorus and aluminum, which directly affects the vitamin D, the formation of the stratum corneum and the accumulation of dry matter in plants and fruits.

520 ~ 610nm (green) light, the pigment absorption ratio is very low.

Therefore, the plant lamp is generally made into a combination of red and blue, all blue, and all red. Generally, the red wavelength is selected from 620 to 630 nm or 640 to 660 nm, and the blue wavelength is selected from 450 to 460 nm or 460 to 470 nm.

A suitable light formula can greatly promote plant growth and development, and increase yield and quality. However, each plant has its own sensitive area for light, so studying efficient light formulas is of great importance in plant production. Changzhou Qianming's latest "various lighting environment simulator" provides a lot of convenience for researchers who study plant light formula.

Second, what is the "Multiple Lighting Environment Simulator"?

Applicable products: LEDCube any lighting scene simulator, LEDSense spectrum adjustable calibration light source

One of the future development directions of semiconductor lighting is intelligent. The so-called intelligence includes not only the switching of the wireless technology control lamp, the adjustment of the brightness, etc., but more importantly, the illumination of the most suitable light (specific spectral power distribution, brightness, etc.) for different application scenarios, such as what light is most Suitable for classroom lighting in primary and secondary schools, what light is most suitable for art lighting, what light is most suitable for home lighting, and what light is most suitable for agricultural lighting. If you need to find the most suitable lighting conditions for different application scenarios, you need to have an illumination platform to simulate any lighting scene for related experiments, and Spectral Power Distribution (SPD) adjustable light source can adjust different wavelengths. The output power is used to achieve the above purpose.

The SPD of the conventional light source is basically fixed. As shown in the following figure, only the brightness and darkness of each light source can be adjusted by the circuit, and the SPD cannot be adjusted.


Tungsten filament lamp and cool white fluorescent lamp SPD

Due to the narrow band of the LED, it is possible to adjust the SPD by adjusting the brightness of the LEDs with different peak wavelengths. The following figure shows the SPD of different peak wavelengths. As we all know, SPD is the most important light quality parameter of light source. If the SPD of a certain light source is reproduced, it is equivalent to reproducing the color temperature, color rendering index, chromaticity coordinates, etc. of the light source, thus realizing the simulation of any lighting scene. the goal of.


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