How Does a UV Flashlight Work? A UV flashlight works by producing and emitting ultraviolet light, which is invisible to the naked eye. This process involves several key components: Light Source (LED or Bulb): The most common light source in UV flashlights is an LED (Light Emitting Diode). LEDs are highly efficient, durable, and compact, making them ideal for portable flashlights. In some older or larger models, UV flashlights may use fluorescent bulbs to produce UV light, though LEDs have largely replaced these. Lens or Filter: UV flashlights have a special lens or optical filter that blocks out visible light, [...]