Will a UV flashlight kill bacteria/viruses?

The only UV flashlights I'm aware of are the ones used for spotting pet stains, scorpions(how cool is that?), body fluids and counterfeit stuff so I assume you're speaking about them. Now, UV light has a wavelength between the 10nm and 400nm and it is split in UVA, UVB and UVC like so. UVA: 400 nm - 320 nm. read more

The dosage, a product of UV light intensity and exposure time, is usually measured in microjoules per square centimeter, or equivalently as microwatt seconds per square centimeter (µW·s/cm 2). Dosages for a 90% kill of most bacteria and viruses range from 2,000 to 8,000 µW·s/cm 2. read more

UV light is electromagnetic radiation with wavelengths shorter than visible light. UV can be separated into various ranges, with short range UV considered “germicidal UV”. At certain wavelengths UV is mutagenic to bacteria, viruses and other micro-organisms. read more