Light is the basic environmental factor for plant growth and development. Light not only supplies the energy needed for plant growth through photosynthesis, but also an important regulatory factor for plant growth and development. Supplementing or illuminating plants with artificial light can promote plant growth, increase yield, improve product form, color, and enhance functional components, etc., and reduce the occurrence of pests and diseases. Today 1 degree sister will share with you the development status and trends of the plant lighting industry
The application of artificial light source technology in the field of plant lighting is becoming more and more widespread. LEDs have many advantages such as high light efficiency, low heat generation, small size, and long life. The advantages in the field of plant lighting are obvious. Plant lighting will gradually use LEDs. Lighting mainly.
I. Development status of LED plant lighting industry
1. Plant lighting package
In the field of plant lighting packaging, there are many types of packaged devices without a unified measurement and evaluation standard system. Large foreign manufacturers mainly focus on high power, COB and module directions, taking into account the white light series of plant lighting, combining plant growth characteristics and humanized lighting environment, compared with domestic The product has great technical advantages in terms of reliability, light efficiency, and photosynthetic irradiation characteristics of different plants in different growth cycles, including a variety of high-power, medium-power and low-power products of different sizes to meet the needs of various plants. The needs of different growing environments are expected to achieve the goals of maximizing plant growth and energy saving.
A large number of core patents for chip epitaxial wafers are still in the hands of early leading companies such as Japan’s Nichia and the American Cree. Domestic chip manufacturers still lack market-competitive patented products. At the same time, many companies are also developing new technologies in the field of plant lighting packaging chips. For example, OSRAM thin film chip technology enables the chips to be tightly packaged together to create a large-area lighting surface. High-efficiency LED lighting systems based on this technology with a wavelength of 660nm can reduce 40% of energy consumption in the cultivation area.
2. Grow plant lighting spectrum and devices
The spectrum of plant lighting is more complex and diverse. Different plants have different growth cycles and even under different growth environments, the required spectrums are quite different. In order to meet these differentiated needs, there are currently several schemes in the industry: ① a variety of monochromatic light combination schemes, the most effective peaks for photosynthesis of plants are 450nm, 660nm spectrum and 730nm band induced by flowering of plants. The three bands are mainly composed of 525nm green light and ultraviolet bands below 380nm. These kinds of spectra are combined according to the different needs of plants to form the most suitable spectrum. ② Full spectrum solution to achieve full coverage of plant demand spectrum. SUNLIKE, represented by Seoul Semiconductor and Samsung, may not be the most efficient spectrum, but it is suitable for all plants, and the cost is much lower than the monochromatic light combination solution. ③ Dominate the full spectrum of white light, and add a 660nm red light combination scheme to improve the effectiveness of the spectrum. This solution is more economical and practical.
Plant lighting monochromatic light (main wavelengths are 450nm, 660nm, 730nm) packaged devices are covered by many companies at home and abroad, while domestic products are more diverse, with more specifications, products from foreign manufacturers are more standardized, while photosynthetic photon flux, There is still a large gap between domestic and foreign packaging manufacturers in terms of light efficiency. In addition to the main wavelength bands of 450nm, 660nm, and 730nm for plant lighting, many manufacturers are also developing new products in other bands to achieve complete photo-synthetically active radiation (PAR) wavelength coverage (450 -730nm).
The monochromatic LED plant growth lamp is not suitable for the growth of any plant. Therefore, the advantages of full-spectrum LEDs are highlighted. The full-spectrum must first achieve full coverage of the full spectrum of visible light (400-700nm), and the blue-green light (470-510nm) must be improved. ), Performance of two bands of deep red light (660-700nm). Ordinary blue LED or ultraviolet LED chips are used with phosphors to achieve the “full” spectrum, and their photosynthetic efficiency varies. Most manufacturers of white LED packaging devices for plant lighting use Blue chip + phosphors to achieve full spectrum. In addition to monochromatic light and blue light or ultraviolet chips and phosphors to achieve white light packaging modes, plant lighting packaging devices also have a mode that uses two or more wavelength chip composite packaging, such as red ten blue / ultraviolet, RGB, RGBW . This packaging mode has great advantages in dimming.
In terms of narrow-wavelength LED products, most packaging suppliers are able to provide customers with various wavelength products in the 365-740nm band. In terms of phosphor-converted plant lighting spectrum, most package manufacturers have multiple spectrums for customers to choose from. Compared with 2016, the sales growth rate in 2017 has achieved a relatively large increase. The growth rate of 660nm LED light sources is concentrated at 20% -50%, and the sales growth rate of phosphor-converted plant LED light sources has reached 50% -200 %, That is, the sales of phosphor-converted plant LED light sources grew faster.
All packaging companies can provide 0.2-0.9 W and 1-3 W general-purpose packaging products. These light sources give luminaire manufacturers great flexibility in luminaire design. In addition, some manufacturers also provide higher power integrated packaging products. Currently, more than 80% of most manufacturers’ shipments are 0.2-0.9 W or 1-3 W. Among them, the shipments of leading international packaging companies are concentrated in 1-3 W, while the shipments of small and medium-sized packaging companies are concentrated in 0.2-0.9 W
3. Fields of grow plant lighting applications
From the field of application, plant lighting fixtures are mainly used in greenhouse supplementary light, full artificial light plant factories, plant tissue culture, field supplementary light, home vegetable and flower planting, and laboratory research.
① In sunlight greenhouses and multi-span greenhouses, the proportion of supplementary light using artificial light is still low, and mainly metal halide lamps and high-pressure sodium lamps. The penetration rate of LED plant lighting systems is low, but the growth rate depends on the cost. The decline began to accelerate, mainly because users have long experience of using metal halide lamps and high-pressure sodium lamps, and the use of metal halide lamps and high-pressure sodium lamps has provided greenhouses with about 6% to 8 while avoiding burns to plants. % Of thermal energy. The LED plant lighting system did not provide specific and effective instructions and data support, which delayed its application in sunlight and multi-span greenhouses. Small-scale demonstration applications are still the mainstay. Because LED is a cold light source, it can be relatively close to the crown of the plant, which has a small temperature effect. LED plant lighting is more commonly used in daylight and multi-span greenhouses.