The difference between violet light and ultraviolet light lies in the different wavelengths of light they emit. The violet lamp mainly emits violet light with the wavelength of 380-420 nm, and the ultraviolet lamp mainly emits ultraviolet light with the wavelength of 100-400 nm. Purple light is mainly used for lighting and beauty, while ultraviolet light is mainly used for sterilization, disinfection and ultraviolet radiation therapy. At the same time, the use of ultraviolet rays needs to be safe to avoid direct contact with ultraviolet rays for a long time, so as not to cause harm to the human body.