In most flashlights, the lamp is either a tungsten filament (incandescent bulb) or a light emitting diode (solid state bulb), also known as an LED. The tungsten filament or LED glows when electricity flows through it, thus producing visible light. ... Tungsten lamps must be replaces when the tungsten filament breaks.
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An electric lamp in which a filament gives off light when heated to incandescence by an electric current.
Answer:
In most flashlights, the lamp is either a tungsten filament (incandescent bulb) or a light emitting diode (solid state bulb), also known as an LED. The tungsten filament or LED glows when electricity flows through it, thus producing visible light. ... Tungsten lamps must be replaces when the tungsten filament breaks.