Editing Timeline of lighting technology (section)

== 20th century ==
* 1900 Frederick Baldwin patents a [[carbide lamp]] for use on bicycles.<ref>{{US patent|656874}}</ref>  The invention builds on acetylene lamps from the 1890s.
* 1901 [[Peter Cooper Hewitt]] creates the first commercial [[mercury-vapor lamp]].
* 1904 [[Alexander Just]] and [[Franjo Hanaman]] invent the [[tungsten]] filament for incandescent lightbulbs.
* 1910 [[Georges Claude]] demonstrates [[neon lighting]] at the [[Paris Motor Show]].
* 1912 Charles P. Steinmetz invents the [[metal-halide lamp]].<ref>{{cite web|title=A brief history of high intensity discharge hid lighting|url=https://www.shineretrofits.com/knowledge-base/lighting-learning-center/a-brief-history-of-high-intensity-discharge-hid-lighting.html|website=Shine Retrofits|access-date=21 December 2017}}</ref>
* 1913 [[Irving Langmuir]] discovers that [[inert gas]] could double the luminous efficacy of incandescent lightbulbs.
* 1917 [[Burnie Lee Benbow]] patents the [[coiled coil]] filament.
* 1920 [[Arthur Compton]] invents the [[sodium-vapor lamp]].<ref>{{cite web|title=Sodium Lamp|url=http://www.edisontechcenter.org/SodiumLamps.html|website=Edison Center|access-date=21 December 2017|url-status=dead|archive-url=https://web.archive.org/web/20140920234320/http://www.edisontechcenter.org/SodiumLamps.html|archive-date=20 September 2014}}</ref>
* 1921 Junichi Miura creates the first incandescent lightbulb to utilize a coiled coil filament.
* 1925 [[Marvin Pipkin]] invents the first internal frosted lightbulb.
* 1926 [[Edmund Germer]] patents the modern fluorescent lamp.
* 1927 [[Oleg Losev]] creates the first [[light-emitting diode|LED]] (light-emitting diode).
* 1953 Elmer Fridrich invents the [[halogen lamp]].<ref>{{cite web|title=20th Century Inventors: Tungsten Halogen Lamp|url=http://americanhistory.si.edu/lighting/bios/frid.htm|website=American History|access-date=21 December 2017}}</ref>
* 1953 André Bernanose and several colleagues observe [[electroluminescence]] in organic materials.<ref>{{cite journal|author= Bernanose, A.|author2= Comte, M.|author3 = Vouaux, P. |journal= J. Chim. Phys.|year = 1953|volume= 50|page= 64|title= A new method of light emission by certain organic compounds|doi= 10.1051/jcp/1953500064}}</ref><ref>{{cite journal|author= Bernanose, A. |author2 = Vouaux, P.|journal= J. Chim. Phys.|year= 1953|volume= 50|page= 261|title= Organic electroluminescence type of emission|doi = 10.1051/jcp/1953500261}}</ref>
* 1960 [[Theodore H. Maiman]] creates the first [[laser]].
* 1962 [[Nick Holonyak]] Jr. develops the first practical visible-spectrum (red) light-emitting diode.
* 1963 Kurt Schmidt invents the first [[Sodium-vapor lamp#High-pressure sodium|high pressure sodium-vapor lamp]].<ref>{{cite web|last1=Schmidt|first1=Kurt|title=High pressure sodium vapor lamp|url=https://patents.google.com/patent/US3248590|website=Google Patents|access-date=21 December 2017}}</ref>
* 1972 [[M. George Craford]] invents the first yellow light-emitting diode.
* 1972 Herbert Paul Maruska and Jacques Pankove create the first violet light-emitting diode.
* 1981 Philips sells their first Compact Fluorescent Energy Saving Lamps, with integrated conventional ballast.
* 1981 Thorn Lighting Group exhibits the [[ceramic metal-halide lamp]].
* 1985 [[Osram]] answers with the first electronic Energy Saving Lamps to be very successful.<ref name="DrThomasKlett" />
* 1987 [[Ching Wan Tang]] and [[Steven Van Slyke]] at [[Eastman Kodak]] create the first practical [[OLED|organic light-emitting diode]] (OLED).
* 1990 Michael Ury, Charles Wood, and several colleagues develop the [[sulfur lamp]].
* 1991 [[Philips]] invents a fluorescent lightbulb that lasts 60,000 hours using [[Electromagnetic induction|magnetic induction]].
* 1994 T5 lamps with cool tips are introduced to become the leading fluorescent lamps with up to 117 lm/W with good color rendering. These and almost all new fluorescent lamps are to be operated on electronic ballasts only.<ref name="DrThomasKlett" />
* 1994 The first commercial [[sulfur lamp]] is sold by Fusion Lighting.
* 1995 [[Shuji Nakamura]] at [[Nichia|Nichia labs]] invents the first practical blue and with additional phosphor, white LED, starting an LED boom.<ref name="DrThomasKlett" />