Research on Plant Lighting Technology
A variety of plant lighting LED light sources were shared in detail, including small and medium-power light sources, discrete high-power light sources, COB light sources, etc.
Among them, the small and medium-power light source packaging technology is mature, the degree of industrialization is high, and the cost advantage is large; the wavelength and spectrum range are wide, regardless of the light source and the plant lighting fixtures are adjustable, the number and color can be freely matched, and the spectrum can be adjusted freely. PPF and energy density are low. Suitable for multi-level vertical farms.
The discrete high-power light source uses high power, high PPF and high energy density; thermo electric separation, good heat dissipation performance, and stable work; it can achieve a variety of light output angles. The cost is high, the temperature of the light source is high when using high power, and good heat dissipation is required, which increases the cost of the lamp.
High PPE product application, suitable for greenhouse planting.
The COB light source has uniform light distribution, which saves the cost of one-time packaging of the light source and the production cost of light engine modules. The installation and production of the plant lighting plant is simple and convenient. The serial-parallel mode of the light source is fixed, unlike the discrete light source, the number and color can be freely matched, and the spectrum can be adjusted freely; the package volume is large and the lamp size is limited. The application of high PPF products can penetrate large plants and grow light on the top.
In terms of plant lighting LED spectrum, there are multiple solutions, involving a variety of monochromatic light combination solutions, blue chip excitation phosphor solutions, full-spectrum solutions, etc.
A variety of monochromatic light combination schemes, mainly blue-red light that is most effective for plant photosynthesis, plus far-red light that induces plant flowering and promotes leaf growth, plus green light and UVA, these spectra are based on different plants Combine the most suitable spectrum according to requirements. The cost is high and it is not suitable for the growth of any plant.
The blue chip excitation phosphor solution uses phosphors with different excitation wavelengths to obtain light energy in different wavelength bands according to the different needs of plants. The cost is much lower than that of the monochromatic light combination solution. PPF and energy density are low.
The full spectrum solution realizes the full coverage of the visible light spectrum (400-700nm) required by plants. It is suitable for all plants and has a lower cost than the monochromatic light combination solution. The PPF and energy density are low, and the full spectrum of purple light excitation is costly.
Mainly with white light, plus the 660nm red light combination scheme to improve the effectiveness of the spectrum, which is more economical and practical; far-red light and UVA can be added according to different types of plants and growth stages.