uv led strip Divided into UVA,UVB, UVC& UVD.What’s the difference between UVA,UVB, UVC& UVD band.

*UVA band, the wavelength of 320 ~ 400nm, also known as UVA rays. It has a strong penetration, can penetrate the most transparent glass and plastic. Ultraviolet sunlight contains more than 98% can penetrate the ozone layer and the clouds to reach the earth’s surface, UVA can the skin dermis,ultraviolet light can produce UVA.300-420nm wavelength can be completely through the special glass tube by coloring the visible light, near ultraviolet radiation only with 365nm as the center, can be used for the identification of ore, stage decoration, lighting and other places.

*UVB band, wavelength as 275 ~ 320nm, also known as medium wave erythema effect. ultraviolet middle-penetration, the shorter wavelength is absorbed by the transparent glass portion, contained UVB sunlight is absorbed by the ozone layer most, only less than 2 percent to reach the Earth’s surface, in the summer, or the afternoon will be particularly strong ultraviolet radiation on the human body with erythema .UVB effect, The UVB can promotes positive blood flow and Forming mineral metabolism & vitamin D in the body, but the long-term or excessive radiation can make the skin tan, and cause redness peeling ultraviolet lamp health, plant growth lamps emit is to use a special transparent purple glass.

*UVC band, wavelength as 200 ~ 275nm,  also known as short-wave UV sterilization. It has the weakest penetration ability, can not penetrate most of the transparent glass and plastic.The sun contains the short wave ultraviolet radiation almost completely absorbed by the ozone layer., the wavelength of 100 ~ 200nm, also known as the vacuum ultraviolet. long-term or high-intensity illumination can also cause skin cancer. UV germicidal UVC light is emitted UVC.

*UVD band, wavelength 100 ~ 200nm, also known as vacuum ultraviolet rays.