A light bulb is an electric lamp consisting of a glass housing containing a wire filament that produces light when heated by electricity. Traditional incandescent light bulbs are being replaced by more energy efficient fluorescent and halogen bulbs as sources of light. Other alternatives, including LED and plasma bulbs, are either available or in development for commercial use.TreeHugger: Luxim Plasma Light Bulb Kicks Some Serious LED Butt (March 29, 2009)
Light Bulb History
Though Thomas Edison is credited with inventing the electric light bulb in 1879, many other inventors' contributions led to the culmination of Edison's light bulb, and advances to light bulb technology have been made almost continuously since then. Some of the other scientists who contributed to the eventual creation of the light bulb are Humphry Davy, James Lindsay, Warren de la Rue, Jean Eugene Robert-Houdin, and Heinrich Gobel.
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References
Fast Facts
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Fact:
Main types are fluorescent, incandescent, and halogen
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Price range for one incandescent bulb
$1 - $2
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Price range for one fluorescent bulb
$10 - $150
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Price range for one halogen bulb
$4 - $75
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Fact:
Compact fluorescent light bulbs are most energy efficient
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Fact:
Many sizes
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Power consumed measured in watts
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Power supply required measured in volts
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The combination of watts and volts will affect the amount of light created by the bulb
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Can come in colors other than clear or white
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Fact:
Incandescent bulbs sometimes used as a heat source, such as in an Easy-Bake Oven
