Pavement lights are usually put into sidewalks or floors to let sunlight into a room below it. They are sometimes called vault lights or sidewalk prisms. They were much used in the late 19th and early 20th centuries when electric lighting was very expensive. Some cities are removing these lights, but others are keeping and restoring them.
Pavement lights give sunlight tobasements below it during the day, and the basement gives light to the sidewalk from below during the night. These lights are meant to make basements more useful in cities and places where space is scarce. In places with high rent, these lights may make an area look better, which helps landlords make more money. People with these lights can also save on electricity during the day, because the lights are clear like a window, where sunlight can go through.
Pavement lights are also used in floors with glass roofs. They could be put in a floor below another floor with more pavement lights, letting sunlight go through more than one floor. Manhole covers were also made with pavement lights.
- Ringuette, Janis; Ringuette, Norm (2007), Walking Over History: Victoria's Historic Sidewalk Prisms, archived from the original on 2008-05-09
- Institute for Public Service, Seattle University, Marie Wong; et al. (2011), Seattle Prism Light Reconnaissance Study (PDF), archived (PDF) from the original on 2016-03-27CS1 maint: multiple names: authors list (link)
- Henry Crew, Ph.D., and Olin H. Basquin, A.M., eds. (1898), "Pocket Hand-book of Electro-glazed Luxfer Prisms containing useful information and tables relating to their use For Architects, Engineers and Builders.", Glassian, archived from the original on 2016-03-10CS1 maint: uses editors parameter (link)
- Padiyath, Raghunath; 3M company, St Paul, Minnesota (2013), Daylight Redirecting Window Films, U.S.A. Department of Defense ESTCP Project number EW-201014, archived from the original on 2017-09-29, retrieved 2017-10-09CS1 maint: multiple names: authors list (link)
- PRESERVATION Tech Notes: Repair and Rehabilitation of Historic Sidewalk Vault Lights, PTN 47 (PDF), National Park Sevice (U.S.A.), November 2003, ISSN 0741-9023, archived (PDF) from the original on 2017-05-06NOTE: colour versions of images available on Commons:Repair and Rehabilitation of Historic Sidewalk Vault Lights at 552-554 Broadway, New York City (2002) (URL formerly "Archived copy". Archived from the original on 2011-04-25. Retrieved 2017-10-08.CS1 maint: archived copy as title (link))
- Macky, Ian, "Prism glass, gallery[of installations worldwide]", Glassian, archived from the original on 2009-03-21
- Gray, Christopher (19 May 2002), "Streetscapes/Subway Platforms; Letting the Sun Shine In", New York Times, archived from the original on 2014-04-30