light bulb

noun
an electric light.

Origin:
1880–85

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
light bulb
 
n
Sometimes shortened to: bulb a glass bulb containing a gas, such as argon or nitrogen, at low pressure and enclosing a thin metal filament that emits light when an electric current is passed through it

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

light bulb
also lightbulb, 1884, from light (n.) + bulb.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The common incandescent light bulb will soon become a lot less common.
He has often told me that the light bulb came back on the day he started
  consuming medium-chain fatty acids.
The new material could be used to make a novel type of organic light bulb.
Most of that ends up as heat, so you warm a room as much as a bright light bulb.
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