Ultraviolet disinfection lamps and ultraviolet light emitted by the sun are both essentially a form of electromagnetic radiation, but there are some important differences between them. 

1, Wavelength range: The sun's ultraviolet rays can be divided into three parts: UVA (315-400 nanometers), UVB (280-315 nanometers) and UVC (100-280 nanometers). However, the ozone layer in the Earth's atmosphere absorbs most of the UVC rays, so what reaches the ground is mainly UVA and a small amount of UVB.

UV sterilizing lamps mainly produce UVC band ultraviolet light, because this band of ultraviolet light has a stronger bactericidal effect, and can damage the DNA or RNA of microorganisms, so that they lose the ability to replicate. 

2, Intensity and duration: The intensity of the sun's ultraviolet light is affected by a variety of factors, including season, time, geographic location and weather conditions. Solar UV may be strongest at midday on a clear summer day. UV sterilizing lamps provide a more consistent and controllable UV intensity and are usually used for a set period of time to ensure effective disinfection is achieved.

3, Safety: Prolonged exposure to the sun's ultraviolet rays, especially UVB, may lead to sunburn and increase the risk of skin cancer. UVC ultraviolet rays are very damaging to human skin and eyes, so direct exposure to humans or animals must be avoided when using UV sterilizing lamps. In summary, although both are UV rays, UVC disinfection lamps are specifically designed for disinfection purposes through the selection of specific wavelengths and intensity control, and are significantly different from the natural sun's UV rays in terms of use and safe handling.