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light bulb
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The first electric light bulb, invented by Thomas Edison, had carbonized thread as its filament, and burned for 45 hours. Edison experimented with many other filaments, including red hair and a mixture of lamp black and tar.

Incandescent filament lamp, first demonstrated by Joseph Swan in the UK in 1878 and Thomas Edison in the USA in 1879. The present-day light bulb is a thin glass bulb filled with an inert mixture of nitrogen and argon gas. It contains a filament made of fine tungsten wire. When electricity is passed through the wire, it glows white hot, producing light.



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LED lightings carry an efficiency of 85 lumens per watt in comparison to the incandescent light bulb which produces only 15 lumens per watt.
CFLs produce the same amount of light as incandescent light bulbs while using a smaller amount of power and having a significantly longer life.
CFLs produce the same amount of light as incandescent light bulbs while using a smaller amount of power and having a significantly longer life.
 
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