Development status and prospect analysis of LED plant growth lamp

- Aug 06, 2019-

LED plant lamp market development status

LED plant lamp sales markets are concentrated in Japan, South Korea, Central America, Europe and other countries and regions engaged in less agricultural personnel.

Plant factories originated in Denmark in 1957 because of lack of sunlight hinders the growth and development of plants. Later, Japan, the United States and the Netherlands invested successively. However, due to high cost, insufficient technology and poor experience, the plant was not well managed.

From the perspective of agricultural development, modern agricultural development, thanks to the use of fertilizers and pesticides, has been able to rapidly increase production to supply the huge food demand generated by the surging population, and has played a major role in solving the global food and poverty problems. However, traditional agriculture is purely dependent on the weather. Not only is crop cultivation restricted by climate and season, but production cannot be completely planned. In addition, in order to ensure the harvest, farmers use a large amount of pesticides to control pests and diseases, thus leading to doubts about food safety. In addition, in order to improve production capacity, excessive use of chemical fertilizers not only increases costs, but also pollutes farmland, rivers, lakes and oceans, and may even cause high nitrate content, thus harming consumers.

Another reason for the plant boom is the global construction industry, which is seeking new growth through investment in agriculture because of the economic downturn and a decline in public construction projects. Restaurant and supermarket chains want to build their own vegetable bases to provide a steady supply of raw materials. As the electronics industry moves overseas, a lot of the cleaning plants used to make chips and other sophisticated components sit idle. As a result, these three industries have been the most aggressive pioneers in investing in plant plants.

Population expansion and water shortage are major global problems. The global population currently stands at 7 billion and is likely to increase to 9.2 billion in the next 40 years. But 80 per cent of the available farmland is already in use, and this, combined with adverse factors such as the abnormal climate, the decrease of arable land, and the trend of young and strong people leaving farming, is a worrying prospect. In addition, traditional agriculture USES about 87% of the world's fresh water resources, so the significant increase of productivity per unit area and the establishment of water-saving technologies are urgent research topics.

At present, there are many LED lighting products used for plant growth, such as flat lamp, double-end lamp, flexible lamp belt, etc., all of which will gradually change with the development of technology. CSAS will gradually carry out the standardization of LED lighting for plant growth according to the development of technology to promote the progress of science and technology and support the development of the industry.

What is LED plant growth lamp

LED plant growth lamp is a kind of plant lamp, it takes LED(light-emitting diode) as the light source, according to the growth rules of plants must need sunlight, with light to replace the sunlight to plant growth and development environment of a lamp.

LED plant growth lamp introduction

Light environment is one of the most important physical environmental factors for plant growth and development.

LED plant growth lamp is LED (light-emitting diode) as the light source, according to the rule of plant growth must need sunlight, with light to replace sunlight to plant growth and development environment of a lamp.

LED plant lamp helps shorten the growth cycle of plants, because the light source of this kind of lamp is mainly composed of red and blue light source, which adopts the most sensitive light band of plants. The wavelength of red light is 620-630nm and 640-660nm, while the wavelength of blue light is 450-460nm and 460-470nm. In the growth process of plants, promote the differentiation of multiple branches and buds, accelerate the growth of roots, stems and leaves, accelerate the synthesis of plant carbohydrates and vitamins, and shorten the growth cycle.

The results show that LED plant lamp is especially suitable for artificial light controlled plant cultivation environment.

The color temperature and lumens of artificial light source are seen by the eyes of living creatures, while the light demand of plants is photosynthesis, which is determined by the radiation value without considering the color temperature and lumens.

Effects of spectral range on plant physiology

•280~315nm -- > this wavelength is ultraviolet light, which can directly suppress the growth of all kinds of animals, plants and even fungi, with minimal impact on morphology and physiological processes.

•315~400nm -- > this kind of light wave is also a kind of far ultraviolet light, although it does not harm plants with ultraviolet light, it has no direct effect on plant growth, so chlorophyll absorption is less, affecting photolytic effect and preventing stem elongation.

• the wavelength of 400~520nm (blue) -- > can directly develop the roots and stems of plants, and has the largest absorption ratio of chlorophyll to carotenoids and the largest impact on photosynthesis.

•520~610nm (green) -- > green plant repulsive push, green element absorption rate is not high.

•610~720nm (red) -- > plants have low chlorophyll absorption, but this wavelength has a significant impact on photosynthesis and plant growth rate.

• the wavelength of 720~1000nm -- > belongs to the pan-infrared wavelength, which has a low absorption rate for plants and can directly stimulate the extension of cells, affecting flowering and seed germination.

• > 1000nm -- > is close to the wavelength of laser light that has been converted to heat.

More plants and spectral data, the effects of each wavelength of light on plant photosynthesis is different, plants need light for photosynthesis, 400 ~ 520 nm light (blue), and 610 ~ 720 nm (red) for the largest contribution to the photosynthesis, and 520 ~ 610 nm (green) light, for plants to exercise the effect of the growth rate is very low.

If, in accordance with the above principle of plants for only 400 ~ 520 nm (blue) and 610 ~ 720 nm (red), the spectrum have direct help growth effect, so the academic concept of plant lights are made combination of red, blue, blue, red all three forms, to provide two wavelengths of light red, blue, used to cover the plant photosynthesis required wavelength range.

In terms of visual effect, led plant growth lamp with red and blue combination presents pink, which is a very uncomfortable color system for biological lighting. However, it can only be used for practical appearance and mainly for practical selection.

General white LED beads, the most common is the use of blue core, to stimulate the yellow phosphor to emit light, resulting in a composite visual white light effect. According to the energy distribution in the integrating sphere test report, there are two peaks in the blue region of 445nm and the yellow-green region of 550nm.

However, the 610 ~720nm red light needed by plants covers less light efficiency needed by plants to supply light and function. This explains why, under white LED light, plants grow less quickly and harvest less efficiently than outdoor plants.

The use of the above data in general plant lamp red and blue lamp chromatographic ratio is generally between 5:1 and 10:1 is appropriate, usually can choose 7~ 9:1 ratio, only the proportion of distribution needs to collect lamp bead brightness ratio for mixing light basis, the number of non-collecting lamp bead for mixing light basis.

Led plant growth lamp is used during plant planting. Generally, the height from the leaves is about 30-50 cm, which needs to be given different light intensity according to the type of planted plants. Height adjustment is generally regarded as the easiest way to adjust the brightness.