Lighting Tips Do you know the role of ultraviolet light?

UVA band, wavelength 320 ~ 400 nanometers (nm), also known as long-wave black spot effect ultraviolet light. It has a strong penetrating power and can penetrate most transparent glass and plastic. More than 98% of the long-wave ultraviolet rays contained in sunlight can penetrate the ozone layer and the cloud layer to reach the surface of the earth. UVA can directly reach the dermis layer of the skin, destroying elastic fibers and collagen fibers, and tanifying our skin. The 360 ​​nanometer (nm) wavelength of UVA ultraviolet light conforms to the insect-like optical rotation reaction curve, and can be used to make trap light. UV-AUV at a wavelength of 300-420 nanometers (nm) can pass through a special colored glass tube that completely cuts off visible light, and emits only near-ultraviolet light centered at 365 nanometers (nm). It can be used for ore identification, stage decoration, and banknote verification. And other places.

UVA (English full name: ultravioletradiation a) long-wave UV

UVB band, wavelength 275 ~ 320 nanometers (nm), also known as medium wave erythema effect ultraviolet light. Medium penetration, its shorter wavelength is absorbed by transparent glass, and most of the medium-wave ultraviolet rays contained in sunlight are absorbed by the ozone layer, and less than 2% can reach the surface of the earth, which is particularly strong in summer and afternoon. UVB UV has an erythema effect on the human body, which can promote mineral metabolism and vitamin D formation in the body, but long-term or excessive exposure will cause the skin to tan, and cause redness and peeling. Ultraviolet health lamps and plant growth lamps are made using special transparent purple glass (light that does not penetrate below 254 nm) and phosphors with peaks around 300 nanometers (nm).

UVB (English full name: ultravioletradiation b) medium wavelength ultraviolet

UVC band, wavelength 200 ~ 275 nanometers (nm), also known as short-wave sterilization UV. It has the weakest penetration and cannot penetrate most of the transparent glass and plastic. The short-wave ultraviolet rays contained in sunlight are almost completely absorbed by the ozone layer. Short-wave ultraviolet rays are very harmful to the human body. Short-term exposure can burn the skin, and long-term or high-intensity exposure can also cause skin cancer. Ultraviolet germicidal lamps emit UVC short-wave ultraviolet rays.

UVC (English full name: ultravioletradiation c) short-wave ultraviolet

UVD band, wavelength 100 ~ 200 nanometers (nm), also known as vacuum ultraviolet.

Sunlight ultraviolet rays are generally classified into long-wave UVA, medium-wavelength UVB, and short-wave UVC depending on the wavelength, of which UVA reaches 95% of the surface, UVB accounts for 5%-2%, and UVC is almost 0%.

Recently, the Japan Industrial Technology Research Institute has used LEDs to produce ultraviolet lamps with bactericidal effects. It is reported that the main sterilization methods are high temperature sterilization, chemical sterilization, and ultraviolet sterilization. Among these sterilization methods, ultraviolet sterilization of mercury lamps is an important sterilization method. Ultraviolet sterilization is effective not only for heat-resistant bacteria, but also has no side effects of chemical sterilization, and can directly act on bacterial DNA to inhibit its proliferation. In particular, DNA absorbs light having a wavelength of about 260 nm, and the bactericidal effect is remarkable. At present, most of the sterilization methods used are low-pressure mercury lamps that emit ultraviolet light of 256 nm wavelength. However, if mercury leaks, it will cause damage to the environment. In addition, the mercury lamp device itself is also very large, so the market requires the development of a UV sterilization device that does not use mercury and is light and simple.

The LED ultraviolet lamp invented by the Japan Industrial Technology Research Institute has the advantages of less power consumption, high safety, and small volume compared with the mercury germicidal lamp currently used. The research team led by Yamazaki Satoshi and Makino Junqing of the Institute successfully developed a near-practical diamond LED with a luminous power of 0.3 mW by modifying the quality of artificial diamonds and improving electronic devices. The team used artificial diamonds to make LEDs with a diameter of 0.5 mm, and used LEDs to illuminate the E. coli coated on the trays to confirm the death of E. coli. The illumination distance is 2 mm and the illumination range is 1 cm. In the future, the research team plans to increase the luminous intensity through the transformation of electronic devices, and verify the short-time sterilization effect, so as to be applied to oral sterilization and tableware sterilization as soon as possible.

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