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Floodlights are broad-beamed , high-intensity artificial lights. They are often used to illuminate outdoor playing fields while an outdoor sports event is being held during low-light conditions. More focused kinds are often used as a stage lighting instrument in live performances such as concerts and plays.
In the top tiers of many professional sports, it is a requirement for stadiums to have floodlights to allow games to be scheduled outside daylight hours. Evening or night matches may suit spectators who have work or other commitment earlier in the day. The main motivation for this is television marketing, especially in sports such as Gridiron which rely on TV rights money to finance the sport. 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 engineers.
Types of floodlight
The most common type of floodlight is the Metal Halide which emits a bright white light (typically 75-100 lumens/Watt). Sodium Vapor Lamps 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. 
In the recent years there have been new developments, and LED technology has come a long way. Now LED flood lights are bright enough to be used for illumination purposes on large sport fields.  The main reason for the use of LEDs, is the lower power consumption and the fact that LED bulbs last longer.
Australian rules football
The first floodlit Australian rules football match was a VFL premiership match, Essendon Football Club vs Geelong Football Club at the Brisbane Exhibition Ground, as part of Round 8, on 16 June 1952.
Cricket was first played under floodlights on Monday, 11 August 1952 in England which was watched by several million people on their television sets. Since then most test playing countries have installed floodlights in some or all of their stadiums. Traditional Cricket floodlights have a long pole on which lights are fixed. This is done because several times, the ball travels too high when a batsman hits it and high lights are needed to keep the ball in sight. However, many cricket stadiums have different types of floodlights like the ANZ Stadium in Australia. The DSC Cricket Stadium in Dubai recently installed Ring of Fire system of floodlights which is latest and smartest system of floodlight in the world.
Darwen FC have reportedly the first floodlit stadium. Floodlighting in association football dates as far back as 1878, when there were floodlit experimental matches at Bramall Lane, Sheffield during the dark winter afternoons. With no national grid, lights were powered by batteries and dynamoes, and were unreliable. Lights were later be used by clubs such as Thames Ironworks, but they stopped the practice after joining the Southern League in 1888.
In the 1930s, Herbert Chapman installed lights into the new West Stand at Highbury 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 1950, Southampton FC'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 (Reserve team) match against Tottenham Hotspur on 1 October 1951. The first international game under floodlights of an England game at Wembley was 30 November 1955 against Spain, England winning 4-1. The first floodlit Football League match took place at Fratton Park, Portsmouth on 22 February 1956 between Portsmouth and Newcastle United.
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, Old Trafford and Anfield were the first major grounds to do this in the early 1990s. The Galpharm Stadium and the JJB Stadium have since been built with traditional floodlights on pylons.
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 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.
For a club to play in the Super League they must have a ground with floodlights adequate for playing a professional game.
Many smaller amateur clubs will have less substantial floodlights, often only suitable for training and not playing a full game. Often they will only illuminate a small part of the playing area.
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