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A filament lamp is a light source in which light is produced by the passing of an electric current through a coil of very thin wire - usually tungsten - which is encased in a bulb of glass (like a torch bulb).
The light is produced because the wire has resistance, which means it will become heated by the electricity passing through it. If it is heated up enough (ie the filament is designed in length etc to have just the right amount of resistance) it will be hot enough to glow brightly and give out the light we see from the bulb.
Filament lamps therefore work differently from fluorescent lamps, halogen lamps or LEDs.
Filament lamps are not very energy-efficient, as light given out depends on the conversion of a relatively-large amount of electricity into heat, first.
Anne Evans
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