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When you go to the bank, you may have seen that the teller will wave the notes under a light while processing them the light being used is a UV light. We now understand how they work, but what exactly are they used for, and why would you need one? Authenticity Checkingįluorescence is used to manufacture government documents and banknotes to help detect fraudulent copies or counterfeit cash. And best of all, they can be acquired for an affordable price and bring unique and useful functionality that you don’t find with other devices. UV flashlights may be able to offer you a glimpse into a world usually hidden from sight. Fluorescent objects will require a UV light to ‘decode’ – and its uses range from simple fun to exploration and even security and forensics. You’re undoubtedly familiar with the term fluorescence, which is the word given to something that exhibits traits that cannot be seen with regular light. A UV light does a great job at providing us with a visual insight into refraction that we don’t see from regular sunlight or lighting that falls outside of the extreme ends of the light spectrum. Sometimes we need a bit of help at seeing things that may not be highlighted or made visible through traditional wavelengths of light. The perception of color is even different between species. While the color of a wavelength is an objective measurement, the colors we perceive are not. What we see is directly tied to how light refracts off objects, creating the color we perceive. It is easy to forget that what we see in our everyday life isn’t quite the objective fact we like to think of it as, with colors, for example, being somewhat of a subjective interpretation. Unlike that of a regular flashlight, the role of a UV flashlight isn’t so much to provide you with a light in the dark but rather to reveal what is missed with the naked eye. We earn an affiliate commission if you buy through our links.