A black light is a type of lamp that emits primarily ultraviolet light and very little visible light. Because the light is outside the range of human vision, it is invisible, so a room illuminated with a black light appears dark. There are many types of black lights, including special fluorescent lamps, LEDs, incandescent lamps, and lasers.. The main difference between ultraviolet light and black light is that, whereas ultraviolet light encompasses the entire ultraviolet range, from 10 nm to 400 nm, black light only refers to long-wave ultraviolet, or ultraviolet A. Although black lights, UVB, and UVC lamps all emit ultraviolet rays, it's important to remember that each one has.

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In This Article. Strictly speaking, a black light is a kind of UV light. Black lights emit ultraviolet radiation (UV light). UV is radiation with a wavelength just shorter than that of violet light, which is the shortest wavelength of light in the visible part of the electromagnetic spectrum. The electromagnetic spectrum is the range of.. Blacklight is purely UVA light, while UV light comprises UVA and UVB. However, the latter doesn't have a trace of far-UVC light. Hence, UV is better suited to sterilization applications than UVA. The main difference between the two is that UV is more potent than black radiation.