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{{Short description|Open source light tube design}}
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'''Liter of Light''' is an [[open source]] design for a low-cost [[light tube]] (or [[deck prism]] or [[vault light]]) that refracts solar light to provide daytime interior lighting for dwellings with thin roofs. [[Daylighting (architecture)|Daylighting]] is cheaper than using indoor electric lights during the day. The device is simple: a transparent [[two-liter bottle]] is filled with water plus a little bleach to inhibit [[algae|algal growth]] and fitted into a hole in a roof. The device functions like a [[deck prism]]: during [[daytime]] the water inside the bottle refracts sunlight, delivering about as much light as a 40–60 watt [[incandescent bulb]] to the interior. A properly installed solar bottle can last up to 5 years.<ref name="Inhabitat">{{cite web|url=http://inhabitat.com/mit-students-install-10000-revolutionary-solar-bottle-lamps-in-manila-slums/ |title=10,000 Dirt Cheap and Life-Altering Plastic Lamps Installed in Manila Slums | Inhabitat - Sustainable Design Innovation, Eco Architecture, Green Building |publisher=Inhabitat |date= 29 July 2011|accessdate=2012-10-04}}</ref><ref>{{cite web|url=http://uk.reuters.com/video/2011/07/11/bringing-light-to-the-poor-one-liter-at?videoId=216968892 |archive-url=https://web.archive.org/web/20110715224707/http://uk.reuters.com/video/2011/07/11/bringing-light-to-the-poor-one-liter-at?videoId=216968892 |url-status=dead |archive-date=2011-07-15 |title=Bringing light to the poor, one liter at a time | Video
== History ==
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== Technology description ==
[[File:Liter_of_Light_cross_section.svg|thumb|upright|Cross-section schematic of a Liter of Light solar bottle:<br/>
• Blue: bottle with water and bleach<br/>
• Green: glue or sealant]]
[[File:Exposicao Lampada de Moser.jpg|thumb|Moser lamps at the Exhibition Innovations - Museum of Tomorrow.]]
The Solar Bottle Bulb, as it has also been called,<ref>{{cite web|author= Kotoe Oshima |url=http://articles.cnn.com/2011-08-30/world/eco.philippines.bottle_1_plastic-bottles-bulbs-slums?_s=PM:WORLD |archive-url=https://web.archive.org/web/20110831210148/http://articles.cnn.com/2011-08-30/world/eco.philippines.bottle_1_plastic-bottles-bulbs-slums?_s=PM:WORLD |url-status=dead |archive-date=August 31, 2011 |title=Plastic bottles light up lives - CNN |publisher=Articles.cnn.com |date=2011-08-30 |accessdate=2012-10-04}}</ref> is installed in the roof of homes with the purpose of refracting sunlight in order to light up a room. The project's innovation lies in its utilization of cheap, durable and readily available materials to produce high quality natural lighting enabling the urban poor to have access to an affordable, environmentally friendly long-term alternative to electric light for use during the day.▼
▲The Solar Bottle Bulb, as it has also been called,<ref>{{cite web|author= Kotoe Oshima |url=http://articles.cnn.com/2011-08-30/world/eco.philippines.bottle_1_plastic-bottles-bulbs-slums?_s=PM:WORLD |title=Plastic bottles light up lives - CNN |publisher=Articles.cnn.com |date=2011-08-30 |accessdate=2012-10-04}}</ref> is installed in the roof of homes with the purpose of refracting sunlight in order to light up a room. The project's innovation lies in its utilization of cheap, durable and readily available materials to produce high quality natural lighting enabling the urban poor to have access to an affordable, environmentally friendly long-term alternative to electric light for use during the day.
=== Glue ===
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Rigid glass bottles are also used,<ref name="glass">{{cite news |title=Solar energy to light up Egypt's poorest villages |url=https://www.wamda.com/2015/02/liter-of-light-egypt-pepsico |work=Wamda |language=en}}</ref> and may be easier to caulk than flexible plastic bottles. Some caulks react chemically with plastic, slowly making it brittle.<ref>{{cite web |title=How To Use Plumbers Putty |url=https://bestplumbersclub.com/plumbing-guides/how-to-use-plumbers-putty/ |website=Best Plumbers Club |language=en-AU |date=29 November 2021}}</ref><ref>{{cite web |last1=Team |first1=Two Make a Home |title=Can plumber's putty be used on plastic? |url=https://twomakeahome.com/can-plumbers-putty-be-used-on-plastic/ |website=Two Make a Home |language=en-us |date=1 December 2021}}</ref> Silicone caulks can chemically bond to glass bottles, which may improve bond durability.
== Countries ==
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In Brazil, everything started in December 2012, when two Brazilians named Alanna Sousa and Pedro Santos decided to implement the Liter of Light project in Brazil. By 2013, Vitor Belota, coincidentally Alanna's neighbor, had the same impetus to bring Liter of Light to Brazil after learning about the project in Kenya. The trio met and carried out a pilot project, where the first daytime solutions were installed in two communities in Santa Catarina.
In 2015, seeing that the context of the Brazilian communities and also the needs were different, Litro de Luz Brasil (Liter of Light Brazil) started working with the nighttime street light, carrying out its first installation action in June of the same year, in the Vila Beira-Mar Community, located in Rio de Janeiro.
Today, Litro de Luz Brasil is established as a non-profit organization and since then has directly impacted the lives of more than 20,000 Brazilians through more than 3,700 solutions, reaching more than 120 communities across the country.<ref>{{cite web|author=Por Litro de Luz Brasil |url=https://www.litrodeluz.com/sobre-nos |title=Origem e presença no Brasil |
=== China===
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The movement in Colombia was started by Camilo Herrera in a small town called [[Duitama]] in the [[Boyaca Department]], approximately 200 kilometers from [[Bogota]].<ref>{{cite web|url=http://www.unlitrodeluzcolombia.org/ |title=Fundacion Un Litro De Luz Colombia | Inicio |publisher=Unlitrodeluzcolombia.org |date= |accessdate=2012-10-04
}}</ref><ref>{{cite web
|url=http://www.eltiempo.com/colombia/boyaca/ARTICULO-WEB-NEW_NOTA_INTERIOR-11164402.html |title=energía solar en Duitama - Colombia Noticias: Actualidad Nacional |publisher=Eltiempo.Com |date= |accessdate=2012-10-04}}</ref> After launching a pilot in Bogota in collaboration with Liter of Light Switzerland in February 2012, a local Bogota organization was created. The first bottles in Bogota were installed in the areas of [[Divino Niño]] and La Colina of Ciudad
|url=http://colombialandoflight.org/index.php?option=com_content&view=article&id=22&Itemid=27&lang=en |title=Ciudad Bolívar, Bogotá |publisher=Colombialandoflight.org |date= |accessdate=2012-10-04
}}</ref> The volunteers in Bogota are also working closely with [[Un Techo Para Mi Pais]] to identify areas in need.<ref>{{cite web|url=http://www.untechoparamipais.org/colombia/sitio/ |accessdate=May 31, 2012 |url-status=dead |archiveurl=https://web.archive.org/web/20120530002143/http://www.untechoparamipais.org/colombia/sitio/ |archivedate=May 30, 2012 |title=Un Techo Para Mi País Colombia }}</ref>
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=== France ===
In 2015, Liter of Light France was created. The French branch is developing an important link between pedagogical project in Europe and the international cooperation around the world. The NGO wants in Europe to make the new generation aware of the [[energy poverty]] reality and show that they can have, with a small activity, a huge social and environmental impact. The NGO wants, as well, to deliver the message to developing countries that a new generation all around the world are caring about the World Citizenship. During International cooperation, Liter of Light France is underlining the main philosophies of the movement as technological innovation accessible to everybody, capacity building, and initiatives South-South. The movement in France was started by Olivier Lasbouygues, Paola Sierra and Isabel Rico. {{cn|date=July 2024}}
=== India ===
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=== Mexico ===
Liter of Light began in Mexico in early 2013, sponsored by Qohélet A.C.<ref>{{Cite web|url=http://literoflight.wix.com/mexico#!about/cipy|title = Inicio}}</ref> Founded by Tere Gonzalez, who had previously worked with Liter of Light in India & Spain, the group began operations with a pilot program in the state of Chihuahua México, where they were able to benefit 114 people. As of September 2013, they are working to complete the next phase of installations in Ajusco, Mexico City, to benefit a further 500 families.<ref>{{Cite web |last=García |first=Bernardín |title=Innova EXATEC sistema de iluminación ecológico con Liter of Light México |url=https://egresados.itesm.mx/egresados/plsql/NoticiasPortalOr.NPO_Inicio?l_noticia=3504 |url-status=deviated |archive-url=https://web.archive.org/web/20170617084622/https://egresados.itesm.mx/egresados/plsql/NoticiasPortalOr.NPO_Inicio?l_noticia=3504 |archive-date=2017-06-17 |access-date=3 Aug 2023 |website=EXATEC |language=es}}</ref>
=== Nepal ===
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=== Zambia ===
A local project is underway.{{citation needed|date=June 2013}}
==Awards and recognition==
* '''2014:'''The [[World Habitat Award]]<ref name="About"/>
* '''2015:''' The [[Zayed Future Energy Prize]]<ref name="About"/>
* '''2016:''' The [[St Andrews Prize for the Environment]]<ref name="About">{{cite web |title=About |url=https://literoflight.org/about/ |access-date=4 March 2023}}</ref>
==See also==
* [[Anidolic lighting]] and [[Daylighting (architecture)|Daylighting]], broader concepts
* [[Deck prism]] and [[Vault light]], older glass versions
* [[Daylight redirecting film]]
* [[Glass brick]]
== References ==
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