tomas edison creats the first light bulb : 1879

Description of cover timeline

Out with the Carbon Filament and in with the Tungsen:1901

 

First Light Emitting Diode (LED) Is Invented:1962

first cfl hits the market:1985

first residental led bulb hits the market: 2002 -2008

Philips Wins L Prize 60-Watt Replacement Category:2011

49 Million LED Products Installed:2012

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