It is understood that the development of the standard in the process of soliciting the opinions of a number of UV enterprises and institutions, in order to improve the quality of leaf vegetables, vegetables grow strong seedlings production of UV LED lighting system to provide a reference standard.
There is no standard or standard requirement for UV LED light source in artificial plant. The establishment of this standard can promote the healthy development of the industry.
Light is one of the most important factors in plant growth. Previously, the LED light source used for plant production was mainly composed of visible light in red (600nm-700nm) and blue (400nm-500nm) bands, because the quantum conversion efficiency of photosynthesis was the highest in this band. But in addition to visible light, which provides energy for photosynthesis, plants need other sources of light to help them grow properly.
Uv radiation (280nm-400nm) is considered to be the key spectrum for the formation of plant quality. Uv radiation within the normal range can not only improve the content of secondary metabolism of plants, but also stimulate the photosynthetic potential and promote plant growth.
In greenhouses and greenhouses, the ultraviolet part of the sun's rays will be greatly reduced due to the absorption of the covering material. Greenhouse plants lack UV-B (280~320nm) of natural sunlight.
It was found that the supplementation of UV-B irradiation could effectively control the plant growth and increase the vitamin C content, but did not cause a significant decrease in yield. The artificial UV-B light source was used to supplement UV-B radiation in the facility, which could improve fruit quality and prevent plant growth. It can reduce the use of chemical methods to prevent vegetable growth and improve vegetable quality, which is an important guarantee for the production of green organic food.
However, so far, there are few reports on the regulation mechanism of medium and long wavelength UV-A and UV-B UV supplementary light on the nutritional quality of vegetable, especially the antioxidants, and there is A lack of effective UV environmental management and regulation technology. The potential of UV-LED applications in plant lighting has yet to be developed.
The high frequency of LED switching power supply is the direction of its development. High frequency makes the switching power supply miniaturized, and makes the switching power supply enter a wider...
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