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A flashlight is a hand-held portable electric-powered light source. usually the light source is a small incandescent light bulb or light-emitting diode (led). a typical flashlight consists of a light bulb mounted in a reflector, a lens to protect the light source and reflector, a battery, and a switch. the invention of the dry cell and miniature incandescent electric light bulbs made the first battery-powered flashlights possible around 1899.