Ultraviolet light is able to kill viruses, ultraviolet sterilization, disinfection principle is to destroy the molecular structure of DNA deoxyribonucleic acid and RNA ribonucleic acid in the cells of microbial organisms, resulting in the death of growth cells or regenerative cell death to achieve the purpose of sterilization, killing. Generally when the intensity of ultraviolet light reaches a very high intensity, most of the bacteria, viruses and other microorganisms will die completely within a second, and a few microorganisms with strong resistance to ultraviolet light can persist for several seconds. But when the intensity of ultraviolet light is not high enough when the ultraviolet light can not quickly kill microorganisms, so the professional UVC germicidal products usually have a higher intensity of ultraviolet light, not natural light and household UV lamps can be compared.