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The ultraviolet range is divided into three bands: Ultraviolet (UV-) light is electromagnetic radiation with a wavelength ranging between X-rays and visible light. When we turn on a blacklight bulb in a dark room, the bulb produces a purplish glow associated with ultraviolet light that we do not see. The blacklight bulb is the type of bulb that produces Ultraviolet-A light. However, we see its effects on our skin, such as sunburns and suntans. The light above violet is ultraviolet light. The human eyes can see visible light in the spectrum ranging from red to violet. They are used to excite fluorescent penetrant or magnetic particle solution in a range visible to the eye. Typical blacklight units used in nondestructive inspection provide an intensity of 1000 micro-watt/cm2 at 15 inches from the face of the blacklight filter. These lights are used in applications in which extraneous visible light must be minimized, mainly to observe fluorescence, the colored glow that many substances give off when exposed to UV light.
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Blacklight lamp emits long-wave UV ‑ A radiation and little visible light.
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Blacklight (or Ultraviolet Light “UV-Light”) is electromagnetic radiation with 320-400 nm wavelengths.