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A floodlight is a broad-beamed, high-intensity
artificial light Lighting or illumination is the deliberate use of light to achieve practical or aesthetic effects. Lighting includes the use of both artificial light sources like lamps and light fixtures, as well as natural illumination by capturing daylight. ...
. It can provide functional area lighting for travel-ways, parking, entrances, work areas, and sporting venues to enable visibility adequate for safe task performance, ornamental lighting for advertising, façades, monuments, or support perimeter security. Floodlights are often used to illuminate outdoor
playing field Play is a range of Motivation#Intrinsic and extrinsic, intrinsically motivated activities done for recreation. Play is commonly associated with children and juvenile-level activities, but may be engaged in at any life stage, and among other high ...
s while an outdoor sports event is being held during low-light conditions. More focused kinds are often used as a
stage lighting instrument Stage lighting instruments (lanterns, or luminaires in Europe) are used in stage lighting to illuminate theatrical productions, concerts, and other performances taking place in live performance venues. They are also used to light television st ...
in live performances such as
concert A concert, often known informally as a gig or show, is a live performance of music in front of an audience. The performance may be carried by a single musician, in which case it is sometimes called a recital, or by a musical ensemble such as an ...
s and
plays Play most commonly refers to: * Play (activity), an activity done for enjoyment * Play (theatre), a work of drama Play may refer also to: Computers and technology * Google Play, a digital content service * Play Framework, a Java framework * P ...
. Floodlights may also be used to add effects to buildings at night, called architectural illumination.


Types

The most common type of floodlight was the metal-halide lamp, which emits a bright white light (typically 75–100 lumens/Watt).
Sodium-vapor lamp A sodium-vapor lamp is a gas-discharge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589  nm. Two varieties of such lamps exist: low pressure, and high pressure. Low-pressure sodium lamps ar ...
s are also commonly used for sporting events, as they have a very high lumen to watt ratio (typically 80–140 lumens/Watt), making them a cost-effective choice when certain lux levels must be provided. These have been replaced by LED floodlights. File:HK CWB Tung Lo Wan 聖馬利亞堂 Saint Mary's Church electric light lamp May-2013.JPG, Metal halide floodlight File:LED floodlights.jpg, LED floodlights File:PH 2.jpg, Halogen floodlight File:Electrodeless induction lamp floodlight.jpg, Electrodeless induction floodlight
LED A light-emitting diode (LED) is a semiconductor device that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons. The color of the light (corresp ...
floodlights are bright enough to be used for illumination purposes on large sport fields. The main advantages of LEDs in this application are their lower power consumption, longer life, and instant start-up (the lack of a "warm-up" period reduces game delays after power outages). They have replaced many metal halide floodlights.
Halogen The halogens () are a group in the periodic table consisting of six chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and the radioactive elements astatine (At) and tennessine (Ts), though some authors would ...
and electrodeless induction floodlights also exist. The first LED lit sports field in the United Kingdom was switched on at Taunton Vale Sports Club on 6 September 2014.


Sports played under floodlights

In the top tiers of many
professional sports In professional sports, as opposed to amateur sports, participants receive payment for their performance. Professionalism in sport has come to the fore through a combination of developments. Mass media and increased leisure have brought larger a ...
, it is a requirement for
stadium A stadium (: stadiums or stadia) is a place or venue for (mostly) outdoor sports, concerts, or other events and consists of a field or stage completely or partially surrounded by a tiered structure designed to allow spectators to stand or sit ...
s to have floodlights to allow games to be scheduled outside daylight hours. Evening or night matches may suit spectators who have work or other commitments earlier in the day, and enable television broadcasts during lucrative
primetime Prime time, or peak time, is the block of broadcast programming taking place during the middle of the evening for television shows. It is mostly targeted towards adults (and sometimes families). It is used by the major television networks to b ...
hours. Some sports grounds which do not have permanent floodlights installed may make use of portable temporary ones instead. Many larger floodlights (see bottom picture) will have gantries for bulb changing and maintenance. These will usually be able to accommodate one or two maintenance workers.


Polo

The first sport to play under floodlights was
polo Polo is a stick and ball game that is played on horseback as a traditional field sport. It is one of the world's oldest known team sports, having been adopted in the Western world from the game of Chovgan (), which originated in ancient ...
, on 18 July 1878.
Ranelagh Club The Ranelagh Club was a polo club located at Barn Elms in south west London, England. It was founded in 1878 as a split-off from the Hurlingham Club and by 1894 was the largest polo club in the world. The club had approximately 3000 members ...
hosted a match in
Fulham Fulham () is an area of the London Borough of Hammersmith and Fulham in West London, England, southwest of Charing Cross. It lies in a loop on the north bank of the River Thames, bordering Hammersmith, Kensington and Chelsea, London, Chelsea ...
,
London London is the Capital city, capital and List of urban areas in the United Kingdom, largest city of both England and the United Kingdom, with a population of in . London metropolitan area, Its wider metropolitan area is the largest in Wester ...
,
England England is a Countries of the United Kingdom, country that is part of the United Kingdom. It is located on the island of Great Britain, of which it covers about 62%, and List of islands of England, more than 100 smaller adjacent islands. It ...
against
the Hurlingham Club The Hurlingham Club is an exclusive private social and athletic club located in the Fulham area of London, England. Founded in 1869, it has a Georgian-style clubhouse set in of grounds. It is a member of the Association of London Clubs. Hi ...
.


Australian rules football

In August 1879, two matches of
Australian rules football Australian football, also called Australian rules football or Aussie rules, or more simply football or footy, is a contact sport played between two teams of 18 players on an Australian rules football playing field, oval field, often a modified ...
were staged at the
Melbourne Cricket Ground The Melbourne Cricket Ground (MCG), also known locally as the 'G, is a sports stadium located in Yarra Park, Melbourne, Victoria. Founded and managed by the Melbourne Cricket Club, it is the largest stadium in the Southern Hemisphere, the Lis ...
under electric lights. The first was between two "scratch" teams composed of military personnel. The following week, two of the city's leading football clubs, rivals Carlton and
Melbourne Melbourne ( , ; Boonwurrung language, Boonwurrung/ or ) is the List of Australian capital cities, capital and List of cities in Australia by population, most populous city of the States and territories of Australia, Australian state of Victori ...
, played another night match. On both occasions, the lights failed to illuminate the whole ground, and the spectators struggled to make sense of the action in the murky conditions.


Cricket

Cricket Cricket is a Bat-and-ball games, bat-and-ball game played between two Sports team, teams of eleven players on a cricket field, field, at the centre of which is a cricket pitch, pitch with a wicket at each end, each comprising two Bail (cr ...
was first played under floodlights on 11 August 1952, during an
exhibition game An exhibition game (also known as a friendly, scrimmage, demonstration, training match, pre-season game, warmup match, or preparation match, depending at least in part on the sport) is a sporting event whose prize money and impact on the playe ...
at
Highbury stadium Arsenal Stadium was a football stadium in Highbury, London, which was the home of Arsenal Football Club between 6 September 1913 and 7 May 2006. It was popularly known as "Highbury" from the name of the district in which it was located, and ...
in England. International
day/night cricket Day/night cricket, also known as floodlit cricket, is a cricket match that is played either totally or partially under floodlights in the evening. The first regular cricket to be played under floodlights occurred during World Series Cricket, uns ...
, played under floodlights, began in 1979. Since then, many cricket stadiums have installed floodlights and use them for both domestic and international matches. Traditional cricket floodlights are mounted at the top of a tall pole, to elevate them out of the fielder's eyeline when the ball is hit high into the air. However, some cricket stadiums have lower-mounted floodlights, particularly if the stadium is shared with other sports.


Gaelic games

Noel Walsh Noel Walsh (29 December 1935 – 29 April 2020) was an Irish Gaelic footballer, administrator, selector, manager and member of the Defence Forces. As a selector and manager, he worked with the Clare county team. As a provincial administrator ...
's advocacy was pivotal in the spread of floodlights in
Gaelic games Gaelic games () are a set of sports played worldwide, though they are particularly popular in Ireland, where they originated. They include Gaelic football, hurling, Gaelic handball and rounders. Football and hurling, the most popular of the s ...
. When chairman of the Munster Council, Walsh had a pilot project for floodlights at
Austin Stack Park Austin Stack Park is a GAA stadium in Tralee, County Kerry, Ireland. It is one of the stadiums used by Kerry GAA's Gaelic football team and the stadium of the hurling team. The ground was named after Austin Stack, an Irish revolutionary and ...
in
Tralee Tralee ( ; , ; formerly , meaning 'strand of the River Lee') is the county town of County Kerry in the south-west of Republic of Ireland, Ireland. The town is on the northern side of the neck of the Dingle Peninsula, and is the largest town in ...
which "became a template for every county and club ground in the country".


Association football

Bramall Lane Bramall Lane is a association football, football stadium in Sheffield, South Yorkshire, England, which is the home of Sheffield United F.C., Sheffield United. The stadium was originally a cricket ground, built on a road named after the Bramall ...
was the first stadium to host floodlit association football matches, dating as far back as 1878, when there were experimental matches at the
Sheffield Sheffield is a city in South Yorkshire, England, situated south of Leeds and east of Manchester. The city is the administrative centre of the City of Sheffield. It is historically part of the West Riding of Yorkshire and some of its so ...
stadium during the dark winter afternoons. With no national grid, lights were powered by batteries and
dynamo "Dynamo Electric Machine" (end view, partly section, ) A dynamo is an electrical generator that creates direct current using a commutator. Dynamos employed electromagnets for self-starting by using residual magnetic field left in the iron cores ...
es, and were unreliable.
Blackburn Blackburn () is an industrial town and the administrative centre of the Blackburn with Darwen borough in Lancashire, England. The town is north of the West Pennine Moors on the southern edge of the River Ribble, Ribble Valley, east of Preston ...
and
Darwen Darwen is a market town and civil parish in the Blackburn with Darwen borough in Lancashire, England. The residents of the town are known as "Darreners". The A666 road, A666 road passes through Darwen towards Blackburn to the north, Bolton to ...
also hosted floodlit matches in 1878, and in October of the same year 3rd Lanark RV played an exhibition match against
Scottish Cup The Scottish Football Association Challenge Cup,Vale of Leven The Vale of Leven () is an area of West Dunbartonshire, Scotland, in the valley of the River Leven, Dunbartonshire, River Leven. Historically, it was part of The Lennox, the name of which derives from the Gaelic term ''Leamhnach'', meaning ''fie ...
at the first Cathkin Park, with press reports suggesting the lighting from a
Gramme machine A Gramme machine, Gramme ring, Gramme magneto, or Gramme dynamo is an electrical generator that produces direct current, named for its Belgian inventor, Zénobe Gramme, and was built as either a dynamo or a magneto. It was the first generator to p ...
was not successful in illuminating the whole field. Subsequent tests over the next month using three
Siemens Siemens AG ( ) is a German multinational technology conglomerate. It is focused on industrial automation, building automation, rail transport and health technology. Siemens is the largest engineering company in Europe, and holds the positi ...
dynamos at the first Hampden Park,
Rugby Park Rugby Park, also known as The BBSP Stadium Rugby Park for sponsorship reasons, is a association football, football stadium which is the home of Scottish Premiership club Kilmarnock F.C. and is situated in the Scotland, Scottish town of Kilmarnoc ...
in
Kilmarnock Kilmarnock ( ; ; , ), meaning "the church of Mernóc", is a town and former burgh in East Ayrshire situated in southwest Scotland. The town has served as the administrative centre of East Ayrshire Council since 1996 and is the region's main ...
and at
Powderhall Stadium Powderhall Stadium, formerly the Powderhall Grounds, was a multi-sports facility overlooking the Water of Leith on Beaverhall Road, in the Powderhall ( Broughton) area of northern Edinburgh, Scotland. It opened in January 1870 at the height of ...
in
Edinburgh Edinburgh is the capital city of Scotland and one of its 32 Council areas of Scotland, council areas. The city is located in southeast Scotland and is bounded to the north by the Firth of Forth and to the south by the Pentland Hills. Edinburgh ...
produced mixed results, in part due to technical issues and weather conditions.
Nottingham Forest Nottingham Forest Football Club is a professional association football club based in West Bridgford, Nottinghamshire, England. The club competes in the Premier League, the top tier of English football league system, English football. Founde ...
played a floodlit match against Notts Rangers at the
Gregory Ground The Gregory Ground was a football and cricket ground in Nottingham in England. It was the home of Nottingham Forest between 1885 and 1890. It was also used as a cricket ground by Lenton United in between 1888 and 1969. Nottingham Forest Wh ...
, Lenton, Nottingham on 25 March 1889. This match was illuminated by 14 Wells Lights which was a portable illumation system powered by paraffin Each light had 4,000
candlepower Candlepower (abbreviated as cp or CP) is a unit of measurement for luminous intensity. It expresses levels of light intensity relative to the light emitted by a candle of specific size and constituents. The historical candlepower is equal to 0.981 ...
. These lights were placed around the ground and 'illuminated the playing arena well enough for the spectators to follow most, if not all, the points of play' according to the Nottingham Evening Post on 26 March 1889. However the same article also reported on 26 March 1889 that 'a strong wind was blowing from the Radford goal, and this caused the lights on the town side to shed a considerable portion of their radiance on the adjoining fields, so that dark shadows were often thrown upon the playing ground and it was almost impossible to see a case of handling unless the officials were close to'. The match was played at 7:45pm and Forest lost 2-0 watched by 5000 spectators. Thames Ironworks (who would later be re-formed as
West Ham United West Ham United Football Club is a professional Association football, football club based in Stratford, London, Stratford, East London, England. The club competes in the Premier League, the top tier of English football league system, English f ...
) played a number of friendly matches under artificial light at their Hermit Road ground during their inaugural season of 1895–96. These experiments, which included high-profile fixtures against
Arsenal An arsenal is a place where arms and ammunition are made, maintained and repaired, stored, or issued, in any combination, whether privately or publicly owned. Arsenal and armoury (British English) or armory (American English) are mostly ...
and
West Bromwich Albion West Bromwich Albion Football Club (), commonly known as West Brom or The Albion, is a professional association football club based in West Bromwich, West Midlands, England. They compete in the EFL Championship, the second level of the Englis ...
, were set up using engineers and equipment from the
Thames Ironworks and Shipbuilding Company The Thames Ironworks and Shipbuilding Company, Limited was a shipyard and iron works straddling the mouth of Bow Creek at its confluence with the River Thames, at Leamouth Wharf (often referred to as Blackwall) on the west side and at Cann ...
. A women's football match in 1921 used floodlights, when
Preston North End Preston North End Football Club, commonly referred to as Preston, North End or PNE, is a professional association football club in Preston, Lancashire, England. They currently play in the EFL Championship, the second level of the English footbal ...
's ground was covered in thick fog and the spectators couldn't see the game. In 1929 the Providence Clamdiggers football club hosted the
Bethlehem Steel The Bethlehem Steel Corporation was an American steelmaking company headquartered in Bethlehem, Pennsylvania. Until its closure in 2003, it was one of the world's largest steel-producing and shipbuilding companies. At the height of its success ...
"under the rays of powerful flood lights, an innovation in soccer" at their
Providence, Rhode Island Providence () is the List of capitals in the United States, capital and List of municipalities in Rhode Island, most populous city of the U.S. state of Rhode Island. The county seat of Providence County, Rhode Island, Providence County, it is o ...
stadium. On 10 May 1933,
Sunderland A.F.C. Sunderland Association Football Club is a professional football club based in Sunderland, Tyne and Wear, England. The team compete in the Premier League, the top tier of the English football league system. Formed in 1879, the club has won si ...
played a friendly match in Paris against
RC Paris Racing Club de France Football, commonly known as Racing Club de France (), is a French football club based in the Paris suburb of Colombes. The club was founded in 1882 as a multi-discipline sports club, and is one of the oldest clubs in Fr ...
under floodlights. The floodlights were fixed to overhead wires strung above and across the pitch. A fresh white coloured ball was introduced after about every 20 minutes and the goalposts were painted yellow. In the 1930s,
Herbert Chapman Herbert Chapman (19 January 1878 – 6 January 1934) was an English Association football, football player and manager. Though he had an undistinguished playing career, he went on to become one of the most influential and successful manage ...
installed lights into the new West Stand at
Highbury Highbury is an area of North London, England, in the London Borough of Islington. Highbury Manor Highbury was once owned by Ranulf, brother of Ilger, and included all the areas north and east of Canonbury and Holloway Roads. The manor hou ...
but the Football League refused to sanction their use. This situation lasted until the 1950s, when the popularity of floodlit friendlies became such that the League relented. In September 1949, South Liverpool's Holly Park ground hosted the first game in England under "permanent" floodlights: a friendly against a Nigerian XI. In 1950,
Southampton Southampton is a port City status in the United Kingdom, city and unitary authority in Hampshire, England. It is located approximately southwest of London, west of Portsmouth, and southeast of Salisbury. Southampton had a population of 253, ...
's stadium, The Dell, became the first ground in England to have permanent floodlighting installed. The first game played under the lights there was on 31 October 1950, in a friendly against Bournemouth & Boscombe Athletic, followed a year later by the first "official" match under floodlights, a
Football Combination The Football Combination was a football competition for the reserve teams of English Football League clubs from Southern England, the Midlands and Wales; other clubs from the Midlands and those from the North playing in the Central League (it is ...
(reserve team) match against
Tottenham Hotspur Tottenham Hotspur Football Club, commonly referred to as simply Tottenham (, , , ) or Spurs, is a professional Association football, football club based in Tottenham, North London, England. The club itself has stated that it should always ...
on 1 October 1951.
Swindon Town Swindon Town Football Club is a professional association football club based in Swindon, Wiltshire, England. The team, known as the "Robins", currently compete in , the fourth level of the English football league system. Founded as Swindon A ...
became the first League side to install floodlights at The County Ground. Their first match being a friendly against Bristol City on Monday 2 April 1951. Arsenal followed five months later with the first match under the Highbury lights taking place on Wednesday 19 September 1951. The first international game under floodlights of an England game at
Wembley Wembley () is a large suburbIn British English, "suburb" often refers to the secondary urban centres of a city. Wembley is not a suburb in the American sense, i.e. a single-family residential area outside of the city itself. in the London Borou ...
was 30 November 1955 against Spain, England winning 4–1. The first floodlit
Football League The English Football League (EFL) is a league of professional association football, football clubs from England and Wales. Founded in 1888 as the Football League, it is the oldest football league in Association football around the world, the w ...
match took place at
Fratton Park Fratton Park is a association football, football ground in Portsmouth, Hampshire, England, and is the home of Portsmouth F.C., Portsmouth Football Club. Fratton Park's location on Portsea Island is unique in English professional football, as it ...
,
Portsmouth Portsmouth ( ) is a port city status in the United Kingdom, city and unitary authority in Hampshire, England. Most of Portsmouth is located on Portsea Island, off the south coast of England in the Solent, making Portsmouth the only city in En ...
on 22 February 1956 between
Portsmouth Portsmouth ( ) is a port city status in the United Kingdom, city and unitary authority in Hampshire, England. Most of Portsmouth is located on Portsea Island, off the south coast of England in the Solent, making Portsmouth the only city in En ...
and
Newcastle United Newcastle United Football Club is a professional association football club based in Newcastle upon Tyne, Tyne and Wear, England. The club competes in the Premier League, the top tier of English football league system, English football. Since th ...
. Many clubs have taken their floodlights down and replaced them with new ones along the roof line of the stands. This previously had not been possible as many grounds comprised open terraces and roof lines on covered stands were too low.
Elland Road Elland Road, or Elland Road Stadium, is a football stadium in Beeston, Leeds, West Yorkshire, England, which has been the Home (sports), home of Leeds United F.C., Leeds United since the club's formation in 1919. The stadium is the List of foot ...
,
Old Trafford Old Trafford () is a football stadium in Old Trafford, Greater Manchester, England, and is the home of Manchester United. With a capacity of 74,197, it is the largest club football stadium (and second-largest football stadium overall after W ...
and
Anfield Anfield is a Association football, football stadium in the area of Anfield (suburb), Anfield, Liverpool, England, which has been the home of Liverpool F.C. since its formation in 1892. The stadium has a seating capacity of 61,276, making it the ...
were the first major grounds to do this in the early 1990s.
Deepdale Deepdale is a football stadium in the Deepdale area of Preston, England that is the home ground of Preston North End. Built in 1875 and in use since 1878, Deepdale is recognised as being one of the oldest continuously used football stadium ...
, The
Galpharm Stadium Kirklees Stadium, currently known as the John Smith's Stadium for sponsorship reasons, is a multi-purpose stadium in Huddersfield, West Yorkshire, England. Since 1994, it has been the home ground of Huddersfield Town Association Football Club ...
and the
JJB Stadium The Brick Community Stadium is a multi-use stadium in Robin Park in Wigan, Greater Manchester, England. It is used by Wigan Warriors rugby league club and Wigan Athletic football club. The stadium is owned by local businessman, Mike Danson, w ...
have since been built with traditional floodlights on pylons.


Rugby league

The first rugby league match to be played under floodlights was on 14 December 1932 when Wigan met Leeds in an exhibition match played at
White City Stadium White City Stadium in London, England, was built for the 1908 Summer Olympics. It hosted the finish of the first modern marathon and swimming, speedway, boxing, show jumping, athletics, stock car racing, concerts and a match at the 1966 FIFA W ...
in London (8pm kick off). Leeds won 18–9 in front of a crowd of over 10,000 spectators. The venture was such a success that the owners of the White City Ground took over the "Wigan Highfield" club and moved them to play Rugby League games at the ground under floodlights the following season, with most of their matches kicking off on Wednesday Nights at 8pm. That venture only lasted one season before the club moved back up north. The first floodlit match for rugby league played in the heartlands was on 31 October 1951 at
Odsal Stadium Odsal Stadium (known as Bartercard Odsal Stadium for sponsorship reasons) is a multi-purpose stadium, multipurpose stadium in Bradford, West Yorkshire, England. The stadium is currently the home of Bradford Bulls rugby league football club and ...
,
Bradford Bradford is a city status in the United Kingdom, city in West Yorkshire, England. It became a municipal borough in 1847, received a city charter in 1897 and, since the Local Government Act 1972, 1974 reform, the city status in the United Kingdo ...
when
Bradford Northern The Bradford Bulls are a professional rugby league club in Bradford, West Yorkshire, England, and compete in the Championship, the second tier of British rugby league. The club have won the League Championship six times, the Challenge Cup f ...
played
New Zealand New Zealand () is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and List of islands of New Zealand, over 600 smaller islands. It is the List of isla ...
in front of 29,072. For a club to play in the
Super League Super League (also known as the Betfred Super League for sponsorship reasons, and legally Super League Europe Ltd.) is a professional rugby league competition, and the highest level of the British rugby league system, which consists of twelve t ...
they must have a ground with floodlights adequate for playing a professional game.


Winter sports

Winter sports, such as skiing and snowboarding, can be held under a floodlit piste.


Motorsports

A number of permanent motor racing circuits are floodlit to allow night races to be held. These include
Yas Marina Circuit The Yas Marina Circuit (Arabic: حلبة مرسى ياس) is a 5.281 km (3.281 mi) motorsport circuit situated on Yas Island, Abu Dhabi, United Arab Emirates. The circuit was designed by Hermann Tilke. It has hosted the season-ending Formula One ...
,
Losail International Circuit The Lusail International Circuit (, sometimes rendered Losail International Circuit) is a motor racing circuit located just outside the city of Lusail, north of Doha, Qatar. The track is in length, with a main straight of . It is surrounded b ...
, and
Bahrain International Circuit The Bahrain International Circuit () is a motorsport venue opened in 2004 and used for drag racing, GP2 Series (now FIA Formula 2 Championship, FIA Formula 2), and the annual Formula One Bahrain Grand Prix. The 2004 Formula One season, 2004 Gr ...
.


See also

*
Street light A street light, light pole, lamp pole, lamppost, streetlamp, light standard, or lamp standard is a raised source of light on the edge of a road or path. Similar lights may be found on a railway platform. When urban electric power distribution b ...
*
Searchlight A searchlight (or spotlight) is an apparatus that combines an extremely luminosity, bright source (traditionally a carbon arc lamp) with a mirrored parabolic reflector to project a powerful beam of light of approximately parallel rays in a part ...
* Vehicle
Headlamp A headlamp is a lamp attached to the front of a vehicle to illuminate the road ahead. Headlamps are also often called headlights, but in the most precise usage, ''headlamp'' is the term for the device itself and ''headlight'' is the term for t ...
* Aircraft
Landing lights Landing lights are lights, mounted on aircraft, that illuminate the terrain and runway ahead during takeoff and landing, as well as being used as a collision avoidance measure against other aircraft and bird strikes. Overview Almost all moder ...
*
Light pollution Light pollution is the presence of any unwanted, inappropriate, or excessive artificial Visible spectrum, lighting. In a descriptive sense, the term ''light pollution'' refers to the effects of any poorly implemented lighting sources, during the ...


References

{{Authority control Light fixtures Stadiums