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light bulb
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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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Light bulbs: AB 722, by Assemblyman Lloyd Levine, D-Van Nuys, would ban the sale of lamps using incandescent light bulbs in California by 2012 in an effort to favor more energy-efficient fluorescent lighting.
LIGHT BULBS, ELEPHANTS, LAUSD LEGISLATORS PROPOSE LAWS AT LAST MINUTE by Daily News (Los Angeles, CA)
Fluorescent light bulbs Last 10 times longer than incandescent bulbs, El use 75 percent less energy, produce fewer greenhouse gases from power plants, and save $30 over the life of each bulb.
Wal-Mart's bright idea by New York Times Upfront
Public Energy Solutions and Con Edison are urging New Yorkers in selected zip codes and targeted load areas who are using 25 or more incandescent light bulbs in their buildings to sign up for free Compact Fluorescent Lamps (CFLs) through Operation Kill-A-Watt (table lamps are excluded).
Operation Kill-A-Watt to give away some green by Real Estate Weekly
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