400 – 320 nm UVA, Long Wave, Black Light.The ultraviolet spectrum is separated into subcategories depending on the wavelength: Ultraviolet light will make fluorescent or luminous pigments fluoresce, emanating visible light. The “color” of above red is called infrared, and the color underneath violet is called ultraviolet. In any case, other invisible “colors” exist above and underneath this spectrum. Unlike some insects, people can just view the spectrum from red to violet. The colors we see are controlled by the wavelength of light vitality. It has wavelengths shorter than normal visible light, making it invisible to the naked eye. Ultraviolet light is a section of the electromagnetic spectrum that reaches the earth from the sun. Ultraviolet light gets its name since it is the light nearest to the violet part of visible light. Ultraviolet light is light with the wavelength in the range of 10 nm to 400 nm with energies from 3eV to 124 eV. Ultraviolet light is an electromagnetic radiation or light that is in between the visible spectrum and x-beams. Today, am going to help you with that, starting with the very basic definitions. To better understand the difference, it’s essential to know what each of the terms means. So in other words, black light is UV light(450-100nm), covering the 400-320nm spectrum. Black light is nothing but UVA light, while UV light is basically composed out of UVA, UVB and UVC. In a nutshell, there isn’t quite a difference, but a misunderstanding of the terms. When reading about uv light, there are these two terms that seem to be confusing: UV light and black light.