What is Light bulb?
{{More sources|date=February 2022}} [[File:Gluehlampe 01 KMJ.jpg|thumb|150px|An incandescent lightbulb]] [[File:Light bulb.png|thumb|A design of an incandescent lightbulb]] A '''light-bulb''' produces [[light]] from [[electricity]].<ref>{{cite web|url=http://www.pa.msu.edu/sciencet/ask_st/061792.html|title=How Does a Lightbulb Work?|date=June 17, 1992|accessdate=20 May 2012|archive-date=8 March 2012|archive-url=https://web.archive.org/web/20120308015220/http://www.pa.msu.edu/sciencet/ask_st/061792.html|url-status=dead}}</ref> In addition to lighting a dark space, they can be used to show an [[Electronics|electronic device]] is on, to direct [[traffic]], for [[heat]], and for many other purposes. Billions are in use, some even in [[outer space]]. Early people used [[candle]]s and [[oil lamp]]s for light. [[Humphry Davy]] invented the electric arclight in the early 1800s. Thomas Alva Edison, Joseph Swann, and several others in the 1880s invented the more efficient incandescent lightbulb. Improved [[vacuum]] pumps and better materials made them shine longer and brighter late in the century.. This became the main kind for the 20th century. Electric [[power station]]s brought electricity to urban and later rural areas to power them.<ref>{{cite web|title=Edison's Inventions|url=http://inventors.about.com/library/inventors/bledison.htm|publisher=about.com|accessdate=21 March 2013}}{{Dead link|date=January 2023 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> Later gas discharge lights, including fluorescent lights, use less electricity to make more light. == Types of light bulbs == There are several kinds of light bulbs: * '''incandescent light bulb''' - the most common light bulb in the house until about 2003-2010 ** ''''halogen lamp'''' - a more efficient incandescent bulb * [[gas discharge lamp]] - a type of light bulb that includes the [[fluorescent lamp|fluorescent light]]. [[Compact fluorescent lamp|Compact fluorescent lights]] (or CFLs) are now replacing incandescent light bulbs in the house * [[light-e