Editing Electric light (section)

=== Incandescent ===
{{Main|Incandescent light bulb}}
[[File:This room is equipped with Edison electric light.jpg|thumb|Sign with instructions on the use of light bulbs]]
[[File:Hagley, St John the Baptist - interior, Mason memorial.jpg|thumb|A tablet at [[Hagley#Churches|St John the Baptist Church, Hagley]] commemorates the installation of electric light in 1934.]]
In its modern form, the incandescent light bulb consists of a coiled filament of [[tungsten]] sealed in a globular glass chamber, either a vacuum or full of an [[noble gas|inert gas]] such as [[argon]]. When an electric current is connected, the tungsten is heated to {{convert|2,000 to 3,300|K|°C °F}} and glows, emitting light that approximates a [[continuous spectrum]].

Incandescent bulbs are highly inefficient, in that just 2–5% of the energy consumed is emitted as [[visible light spectrum|visible, usable light]]. The remaining 95% is lost as [[heat]].<ref>{{cite web |title=High Efficiency Incandescent Lighting {{!}} MIT Technology Licensing Office |url=https://tlo.mit.edu/technologies/high-efficiency-incandescent-lighting |website=tlo.mit.edu |access-date=19 August 2022 |archive-date=19 August 2022 |archive-url=https://web.archive.org/web/20220819185359/https://tlo.mit.edu/technologies/high-efficiency-incandescent-lighting |url-status=live }}</ref> In warmer climates, the emitted heat must then be removed, putting additional pressure on [[Ventilation (architecture)|ventilation]] or [[air conditioning]] systems.<ref>{{cite web |title=6 Ways to Save Money on Your Air Conditioning Bill |url=https://www.nopec.org/blognewsroom/blog/6-ways-to-save-money-on-your-air-conditioning-bill |website=NOPEC |access-date=19 August 2022 |language=en |archive-date=19 August 2022 |archive-url=https://web.archive.org/web/20220819193016/https://www.nopec.org/blognewsroom/blog/6-ways-to-save-money-on-your-air-conditioning-bill |url-status=live }}</ref> In colder weather, the heat byproduct has some value, and has been successfully harnessed for warming in devices such as [[Infrared lamp|heat lamps]]. Incandescent bulbs are nonetheless being [[Phase-out of incandescent light bulbs|phased out]] in favor of technologies like [[Compact fluorescent lamp|CFLs]] and [[LED lamp|LED bulbs]] in many countries due to their low energy efficiency. The [[European Commission]] estimated in 2012 that a complete ban on incandescent bulbs would contribute 5 to 10 billion euros to the economy and save 15 billion metric tonnes of [[carbon dioxide emissions]].<ref>{{cite web |title=Frequently asked questions about the regulation on ecodesign requirements for non-directional household lamps |url=https://ec.europa.eu/commission/presscorner/detail/en/MEMO_09_113 |website=European Commission |access-date=19 August 2022 |language=en |archive-date=19 August 2022 |archive-url=https://web.archive.org/web/20220819191645/https://ec.europa.eu/commission/presscorner/detail/en/MEMO_09_113 |url-status=live }}</ref>