But because these LEDs are so close to the 400 nm cut-off, they still emit much of their energy as violet light. Strictly speaking, these are considered to be ultraviolet LEDs when we use the definition of < 400 nm to define UV. If a seller or manufacturer does not list the wavelength used - be careful - as they could very well be using a violet or purple LED that is not a true UV light source.Ī common wavelength option is 395 nm. As a result, 415 nm (visible, violet light) LEDs and 405 nm (borderline visible violet light) are often used as "ultraviolet" LEDs. pets) or other body fluidsīecause of the trends in LED manufacturing, higher wavelength LEDs are easier and more cost effective to manufacture. curing) but provide enough UV light to observe fluorescence effects.īelow are some use example cases of UV flashlights: UV flashlights are generally not strong enough to induce any chemical or physical reactions (e.g. UV lighting has a wide variety of applications, but UV flashlights can be most useful in situations where portability and ease of use is important. Should I get a UV flashlight for my application? Virtually all UV flashlights use LED technology.
Many objects and substances such as paints, dyes, minerals, animals and body fluids exhibit fluorescence, which means that the presence of these things can be detected only when a UV light source shines on them.Ī UV flashlight takes the same shape and format as a standard white light flashlight, but instead of emitting white light, emits ultraviolet light. When ultraviolet light hits certain objects, they can fluoresce - a phenomenon similar to a bright glow.
A UV flashlight emits ultraviolet radiation - a type of light energy - that is not visible to the human eye.
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