Greenhouse Lighting System

LED plant growth lamp is a kind of plant growth auxiliary lamp with semiconductor lighting principle, which is specially used in plant production such as flowers and vegetables combined with high precision technology. The main reason is that the lack of light irradiation can not only promote the growth, but also prolong the flowering period and improve the quality of flowers. The application of this high-efficiency light source system to agricultural production such as greenhouse and greenhouse can solve the problem that the lack of sunshine leads to the decline of vegetable taste in tomato and cucumber.

Effects on plants

Effects of spectral range on plant physiology

The effects of 280~315 nm： on morphological and physiological processes are minimal

The chlorophyll absorption of 315~400 nm ： was less, which affected photoperiod effect and prevented stem elongation

400~520 nm( blue): Chlorophyll and carotenoid absorption ratio is the largest, the greatest impact on photosynthesis

520~610 nm( green): pigment absorption rate is low

610~720 nm( red): Low chlorophyll uptake significantly affected photosynthesis and photoperiod

Low absorption ~720~1000 nm ：, prolonged stimulation of cells, effects of flowering and seed germination

>1000 nm: converted to heat

Data analysis

Judging from the above data, the effects of different wavelengths of light on plant photosynthesis are different. The wavelength of plant photosynthesis is about 400~720 nm. Light ~520 nm( blue) and 610~720(red) contribute most to photosynthesis. Light from 520~610 nm( green) has a low rate of absorption by plant pigments.

According to the above principle, plant lights are basically made into red and blue combination, all blue, all red three forms, to provide red and blue two wavelengths of light, covering the wavelength range required for photosynthesis. In visual effect, the red and blue combination of plant lights appear pink.

White LED lights, most commonly using blue cores, excite yellow phosphors, resulting in a composite of visual white light effects. There are two peaks in the blue region of 445 nm and the yellowish green region of 550 nm in the energy distribution. while the plant required 610~720 nm red light, which was very scarce. which explains why plant growth is unfavorable under white light LED irradiation.

The chromatographic ratio of red and blue lamp of plant lamp is between 5:1~10:1, and the ratio of 7~8:1 is usually optional. Of course, the best proportion of red and blue light can be adjusted according to plant growth cycle.

The general power is less than 50 wLED. For different plants, the height from the main leaf surface of the plant is 0.2~0.8 meters, and the power is higher than 50 wLED for different plants. The height from the main leaf surface of the plant is 0.5~1.5 meters.

Shortcomings of the spectrum

LED the light supply of plants, the spectrum is limited to the visible part, mainly composed of red light and blue light, which is pink light, and the color rendering is very low, which is not conducive to the preservation of light

LED plant lighting and effects

LED lights and effects (4 sheets)

Protect eyesight, especially in the light environment for a long time, easy to make people dizziness and nausea, vision decline.

LED the light spectrum of plants, there is almost no ultraviolet ray, but ultraviolet light plays a role in improving the brightness of flowers. The reason why the flowers in plateau area are particularly bright is because of the rich ultraviolet radiation.

In addition, ultraviolet light can promote sugar synthesis and increase the sugar content of special berry plants.

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