What does UV400 mean?
Apr 06, 2022
UV400 means 100% UV-resistant. Ultraviolet rays refer to sunlight with wavelengths between 200nm and 380nm, including three types: UVA wavelengths of 315nm to 380nm, UVB wavelengths of 280nm to 315nm, and UVC wavelengths of 200nm to 280nm. Ultraviolet rays account for about 13% of the solar rays (290nm-2000nm) reaching the earth's surface.
