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A UV torch is a great tool to see and observe things that are normally invisible to the naked eye. UV flashlights, or black light flashlights, have the same shape and size as a standard flashlight, but they can emit ultraviolet radiation that is not visible to the human eye. But when this light hits certain objects like paints, dyes, minerals, animals, and body fluids, they will fluoresce. Therefore, UV flashlights are widely used and applied for different purposes such as forensics and counterfeit verification, mineral and gemstone observation, urine stains or other body fluid investigation, and insect and reptile searches.

The wavelength of a UV torch

The wavelength of a UV blacklight flashlight is important because it requires the correct wavelength for its induced fluorescence to take effect. UV light is a general term for a wide range of UV wavelengths across the UV spectrum, but not all of its wavelengths are capable of producing sufficient fluorescence effects. 365nm UV flashlights are favored by the market because most fluorescence has wavelengths of around 360nm. UV LED flashlights with longer wavelengths are more cost-effective due to the trends in LED manufacturing, as most UV flashlights use LED technology. These flashlights often come in 415nm and 405nm wavelengths.

How much UV light can a UV torch pump out?

In general, two specifications of a UV light flashlight affect how much light it can pump out. First is its power consumption, and the second is its LED efficiency. Most small ultraviolet flashlights will run at about 1W, and larger ones may run at about 3W. Keep in mind that only the total power of the LED matters, instead of the quantity of the LED. For example, one LED running at 3 watts is more powerful than three LEDs running at 0.5 watts each. For LED efficiency, since not all LEDs convert the same ratio of electrical energy to UV light energy, a high-power black light torch is not able to produce much useful UV light output if it has a low-power consumption LED. UV flashlights can be powered by disposable batteries, but rechargeable UV flashlights are also available in the market.

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