LED is characterized by single band light emission, the wavelength of visible light is generally above 390nm, and ultraviolet light is less than 380nm, so there is no ultraviolet component.The light-emitting mechanism of LED is different from that of fluorescent lamp. White LEDs emit fixed-frequency blue light through the LED blue chip and emit special phosphors to announce white light, so there is no UV at all.

There are UV rays that people can't see. It is not because of white light that it can tell if there is UV. Violet LED can only guarantee violet visible light at most, violet wavelength is above 380NM, UV is less than 380NM. even if violet belongs to led, it will not produce UV light.