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A searchlight (or spotlight) is an apparatus that combines an extremely
bright Bright may refer to: Common meanings *Bright, an adjective meaning giving off or reflecting illumination; see Brightness *Bright, an adjective meaning someone with intelligence People * Bright (surname) * Bright (given name) *Bright, the stage na ...
source (traditionally a
carbon arc lamp An arc lamp or arc light is a lamp that produces light by an electric arc (also called a voltaic arc). The carbon arc light, which consists of an arc between carbon electrodes in air, invented by Humphry Davy in the first decade of the 1800s, ...
) with a mirrored
parabolic reflector A parabolic (or paraboloid or paraboloidal) reflector (or dish or mirror) is a Mirror, reflective surface used to collect or project energy such as light, sound, or radio waves. Its shape is part of a circular paraboloid, that is, the surface ge ...
to project a powerful beam of
light Light, visible light, or visible radiation is electromagnetic radiation that can be visual perception, perceived by the human eye. Visible light spans the visible spectrum and is usually defined as having wavelengths in the range of 400– ...
of approximately parallel rays in a particular direction. It is usually constructed so that it can be swiveled about. The most common element used in modern searchlights is Xenon (Xe). However,
Rare-earth elements The rare-earth elements (REE), also called the rare-earth metals or rare earths, and sometimes the lanthanides or lanthanoids (although scandium and yttrium, which do not belong to this series, are usually included as rare earths), are a set of ...
such as lanthanum (La) and cerium (Ce) are used in
phosphors A phosphor is a substance that exhibits the phenomenon of luminescence; it emits light when exposed to some type of radiant energy. The term is used both for fluorescent or phosphorescent substances which glow on exposure to ultraviolet or v ...
to improve light quality in some specialized searchlights.


Military use

The first use of searchlights using carbon arc technology occurred during the Siege of Paris during the
Franco-Prussian War The Franco-Prussian War or Franco-German War, often referred to in France as the War of 1870, was a conflict between the Second French Empire and the North German Confederation led by the Kingdom of Prussia. Lasting from 19 July 1870 to 28 Janua ...
. The
Royal Navy The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ...
used searchlights in 1882 to dazzle and prevent Egyptian forces from manning artillery batteries at
Alexandria Alexandria ( ; ) is the List of cities and towns in Egypt#Largest cities, second largest city in Egypt and the List of coastal settlements of the Mediterranean Sea, largest city on the Mediterranean coast. It lies at the western edge of the Nile ...
. Later that same year, the French and British forces landed troops under searchlights. By 1907 the value of searchlights had become widely recognized. One recent use was to assist attacks by
torpedo boat A torpedo boat is a relatively small and fast naval ship designed to carry torpedoes into battle. The first designs were steam-powered craft dedicated to ramming enemy ships with explosive spar torpedoes. Later evolutions launched variants of ...
s by dazzling gun crews on the ships being attacked. Other uses included detecting enemy ships at greater distances, as signaling devices, and to assist landing parties. Searchlights were also used by battleships and other capital vessels to locate attacking torpedo boats and were installed on many coastal artillery batteries for aiding night combat. They saw use in the
Russo-Japanese War The Russo-Japanese War (8 February 1904 – 5 September 1905) was fought between the Russian Empire and the Empire of Japan over rival imperial ambitions in Manchuria and the Korean Empire. The major land battles of the war were fought on the ...
from 1904–05. Searchlights were installed on most naval
capital ship The capital ships of a navy are its most important warships; they are generally the larger ships when compared to other warships in their respective fleet. A capital ship is generally a leading or a primary ship in a naval fleet. Strategic i ...
s from the late 19th century through
WWII World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
, both for tracking small, close-in targets such as
torpedo boat A torpedo boat is a relatively small and fast naval ship designed to carry torpedoes into battle. The first designs were steam-powered craft dedicated to ramming enemy ships with explosive spar torpedoes. Later evolutions launched variants of ...
s, and for engaging enemy units in nighttime gun battles. The
Imperial Japanese Navy The Imperial Japanese Navy (IJN; Kyūjitai: Shinjitai: ' 'Navy of the Greater Japanese Empire', or ''Nippon Kaigun'', 'Japanese Navy') was the navy of the Empire of Japan from 1868 to 1945, Potsdam Declaration, when it was dissolved followin ...
especially was known for its intensive development of nighttime naval combat tactics and extensive training. The
War in the Pacific The Pacific War, sometimes called the Asia–Pacific War or the Pacific Theatre, was the Theater (warfare), theatre of World War II fought between the Empire of Japan and the Allies of World War II, Allies in East Asia, East and Southeast As ...
saw a number of nocturnal engagements fought by searchlight, particularly the Battle of Savo Sound at Guadalcanal. Although searchlights remained in use throughout the war, the newly developed
radar Radar is a system that uses radio waves to determine the distance ('' ranging''), direction ( azimuth and elevation angles), and radial velocity of objects relative to the site. It is a radiodetermination method used to detect and track ...
proved to be a far more effective locating device, and Japanese radar development lagged far behind that of the US.


First World War

Searchlights were first used in the
First World War World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...
to create "artificial moonlight" to enhance opportunities for night attacks by reflecting searchlight beams off the bottoms of clouds, a practice which continued in the
Second World War World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
. The term "artificial moonlight" was used to distinguish illumination provided by searchlights from that provided by natural moonlight, which was referred to as "movement light" in night-time manoeuvers. Searchlights were also heavily used in the defense of the UK against German nighttime bombing raids using
Zeppelins A Zeppelin is a type of rigid airship named after the German inventor Ferdinand von Zeppelin () who pioneered rigid airship development at the beginning of the 20th century. Zeppelin's notions were first formulated in 1874Eckener 1938, pp. 155 ...
.


Second World War

Searchlights were used extensively in defense against nighttime
bomber A bomber is a military combat aircraft that utilizes air-to-ground weaponry to drop bombs, launch aerial torpedo, torpedoes, or deploy air-launched cruise missiles. There are two major classifications of bomber: strategic and tactical. Strateg ...
raids during the
Second World War World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
. Controlled by sound locators and radars, searchlights could track bombers, indicating targets to anti-aircraft guns and night fighters and dazzling crews. Searchlights were occasionally used tactically in ground battles. One notable occasion was the
Red Army The Workers' and Peasants' Red Army, often shortened to the Red Army, was the army and air force of the Russian Soviet Republic and, from 1922, the Soviet Union. The army was established in January 1918 by a decree of the Council of People ...
use of searchlights during the
Battle of the Seelow Heights The Battle of the Seelow Heights () was part of the Berlin Strategic Offensive Operation (16 April – 2 May 1945). A pitched battle, it was one of the last assaults on large entrenched defensive positions of the Second World War. It was fough ...
in April 1945. 143 searchlights were directed at the German defence force, with the aim of temporarily blinding them during a Soviet offensive, begun with the largest artillery bombardment the world had ever seen until that point. However, the morning fog diffused the light and silhouetted the attacking Soviet forces, making them clearly visible to the Germans. The Soviets suffered heavy losses as a result and were forced to delay their invasion of the city. Second World War-era searchlights include models manufactured by
General Electric General Electric Company (GE) was an American Multinational corporation, multinational Conglomerate (company), conglomerate founded in 1892, incorporated in the New York (state), state of New York and headquartered in Boston. Over the year ...
and by the Sperry Company. These were mostly of 60 inch (152.4 cm) diameter with
rhodium Rhodium is a chemical element; it has symbol Rh and atomic number 45. It is a very rare, silvery-white, hard, corrosion-resistant transition metal. It is a noble metal and a member of the platinum group. It has only one naturally occurring isot ...
plated parabolic mirror, reflecting a
carbon arc An arc lamp or arc light is a lamp that produces light by an electric arc (also called a voltaic arc). The carbon arc light, which consists of an arc between carbon electrodes in air, invented by Humphry Davy in the first decade of the 1800s, ...
discharge. Peak output was 800,000,000
candela The candela (symbol: cd) is the unit of luminous intensity in the International System of Units (SI). It measures luminous power per unit solid angle emitted by a light source in a particular direction. Luminous intensity is analogous to radi ...
. It was powered by a 15 kW generator and had an effective beam visibility of 28 to 35 miles (45 to 56 km) in clear low humidity. The searchlight also found a niche for use by
night fighter A night fighter (later known as all-weather fighter or all-weather interceptor post-Second World War) is a largely historical term for a fighter aircraft, fighter or interceptor aircraft adapted or designed for effective use at night, during pe ...
s and
anti-submarine warfare Anti-submarine warfare (ASW, or in the older form A/S) is a branch of underwater warfare that uses surface warships, aircraft, submarines, or other platforms, to find, track, and deter, damage, or destroy enemy submarines. Such operations ar ...
aircraft. The
Turbinlite The Helmore/ GEC Turbinlite was a 2,700 million candela (2.7 Gcd) searchlight fitted in the nose of a number of British Douglas Havoc night fighters during the early part of the Second World War and around the time of The Blitz. The ...
was a powerful searchlight mounted in the nose of an RAF
Douglas Boston The Douglas A-20 Havoc (company designation DB-7) is an American light bomber, attack aircraft, Intruder (air combat), night intruder, night fighter, and reconnaissance aircraft of World War II. Designed to meet an Army Air Corps requirement for ...
light bomber A light bomber is a relatively small and fast type of military bomber aircraft that was primarily employed before the 1950s. Such aircraft would typically not carry more than one ton of ordnance. The earliest light bombers were intended to dr ...
, converted into a night fighter to shoot down
Luftwaffe The Luftwaffe () was the aerial warfare, aerial-warfare branch of the before and during World War II. German Empire, Germany's military air arms during World War I, the of the Imperial German Army, Imperial Army and the of the Imperial Ge ...
night
bomber A bomber is a military combat aircraft that utilizes air-to-ground weaponry to drop bombs, launch aerial torpedo, torpedoes, or deploy air-launched cruise missiles. There are two major classifications of bomber: strategic and tactical. Strateg ...
s. The aircraft would be directed in the general direction of the enemy by ground-based or metre-wave airborne radar, and the pilot would then switch on the Turbinlite, illuminating the enemy aircraft, which would then be shot down by accompanying RAF
day fighter A day fighter is a fighter aircraft equipped only to fight during the day. More specifically, it refers to a multi-purpose aircraft that does not include equipment for fighting at night (such as a radar and specialized avionics), although it is som ...
s such as the
Hawker Hurricane The Hawker Hurricane is a British single-seat fighter aircraft of the 1930s–40s which was designed and predominantly built by Hawker Aircraft Ltd. for service with the Royal Air Force (RAF). It was overshadowed in the public consciousness by ...
. This never proved very successful, as the light made the emitting aircraft a very big target for rear gunners, who would simply have to shoot into the light and be guaranteed to hit something eventually. During the Battle of the North Atlantic, RAF aircraft such as the
Vickers Wellington The Vickers Wellington (nicknamed the Wimpy) is a British twin-engined, long-range medium bomber. It was designed during the mid-1930s at Brooklands in Weybridge, Surrey. Led by Vickers-Armstrongs' chief designer Rex Pierson, a key feature of t ...
were assigned to patrol for surfaced German
U-boat U-boats are Submarine#Military, naval submarines operated by Germany, including during the World War I, First and Second World Wars. The term is an Anglicization#Loanwords, anglicized form of the German word , a shortening of (), though the G ...
s at night, when they would be on the surface, charging their batteries. A large searchlight called a
Leigh light The Leigh Light (L/L) was a British World War II era anti-submarine device used in the Battle of the Atlantic. It was a powerful (22 million candelas) carbon arc searchlight of diameter fitted to a number of the British Royal Air Force' ...
was suspended from the bottom of the
wing A wing is a type of fin that produces both Lift (force), lift and drag while moving through air. Wings are defined by two shape characteristics, an airfoil section and a planform (aeronautics), planform. Wing efficiency is expressed as lift-to-d ...
or
fuselage The fuselage (; from the French language, French ''fuselé'' "spindle-shaped") is an aircraft's main body section. It holds Aircrew, crew, passengers, or cargo. In single-engine aircraft, it will usually contain an Aircraft engine, engine as wel ...
, and would be used to illuminate the surfaced U-boat while it was being attacked with
bomb A bomb is an explosive weapon that uses the exothermic reaction of an explosive material to provide an extremely sudden and violent release of energy. Detonations inflict damage principally through ground- and atmosphere-transmitted mechan ...
s and
depth charge A depth charge is an anti-submarine warfare (ASW) weapon designed to destroy submarine A submarine (often shortened to sub) is a watercraft capable of independent operation underwater. (It differs from a submersible, which has more limited ...
s. The Leigh light was somewhat more successful than the Turbinlite, but in both cases the development of centimeter-wave radar proved to be the far more effective answer.


War in Ukraine

During the
2022 Russian invasion of Ukraine On 24 February 2022, , starting the largest and deadliest war in Europe since World War II, in a major escalation of the Russo-Ukrainian War, conflict between the two countries which began in 2014. The fighting has caused hundreds of thou ...
, both the
Russian Armed Forces The Armed Forces of the Russian Federation, commonly referred to as the Russian Armed Forces, are the military of Russia. They are organized into three service branches—the Russian Ground Forces, Ground Forces, Russian Navy, Navy, and Russi ...
and
Territorial Defence Forces (Ukraine) The Territorial Defence Forces ( TDF; , , ) are the Military reserve force, military reserve component of the Armed Forces of Ukraine. The Territorial Defence Forces were formed after the reorganization of the Territorial defence battalions ...
have extensively used spotlights for both
Civil defense Civil defense or civil protection is an effort to protect the citizens of a state (generally non-combatants) from human-made and natural disasters. It uses the principles of emergency management: Risk management, prevention, mitigation, prepara ...
purposes, as well as frontline anti-drone and
anti-aircraft warfare Anti-aircraft warfare (AAW) is the counter to aerial warfare and includes "all measures designed to nullify or reduce the effectiveness of hostile air action".AAP-6 It encompasses surface-based, subsurface (Submarine#Armament, submarine-lau ...
.


Non-military use

Today, searchlights are used in
advertising Advertising is the practice and techniques employed to bring attention to a Product (business), product or Service (economics), service. Advertising aims to present a product or service in terms of utility, advantages, and qualities of int ...
,
fairs A fair (archaic: faire or fayre) is a gathering of people for a variety of entertainment or commercial activities. Fairs are typically temporary with scheduled times lasting from an afternoon to several weeks. Fairs showcase a wide range of go ...
,
festivals A festival is an event celebrated by a community and centering on some characteristic aspect or aspects of that community and its religion or cultures. It is often marked as a local or national holiday, Melā, mela, or Muslim holidays, eid. A ...
and other public events. Their use was once common for
movie A film, also known as a movie or motion picture, is a work of visual art that simulates experiences and otherwise communicates ideas, stories, perceptions, emotions, or atmosphere through the use of moving images that are generally, sinc ...
premiere A premiere, also spelled première, (from , ) is the debut (first public presentation) of a work, i.e. play, film, dance, musical composition, or even a performer in that work. History Raymond F. Betts attributes the introduction of the ...
s; the waving searchlight beams can still be seen as a design element in the logos of
20th Century Studios 20th Century Studios, Inc., formerly 20th Century Fox, is an American film studio, film production and Film distributor, distribution company owned by the Walt Disney Studios (division), Walt Disney Studios, the film studios division of the ...
and the
Fox television network Fox Broadcasting Company, LLC (commonly known as Fox; stylized in all caps) is an American commercial broadcast television network serving as the flagship property of Fox Corporation and operated through Fox Entertainment. Fox is based at Fo ...
. The world's most powerful searchlight today beams from the top of the pyramid-shaped
Luxor Hotel Luxor Las Vegas is a casino hotel on the southern end of the Las Vegas Strip in Paradise, Nevada. The resort is owned by Vici Properties and operated by MGM Resorts International. The Luxor features an ancient Egyptian theme, and includes a ca ...
in
Las Vegas Las Vegas, colloquially referred to as Vegas, is the most populous city in the U.S. state of Nevada and the county seat of Clark County. The Las Vegas Valley metropolitan area is the largest within the greater Mojave Desert, and second-l ...
. It concentrates about 13,650,000
lumens The lumen (symbol: lm) is the SI unit of luminous flux, which quantifies the perceived power of visible light emitted by a source. Luminous flux differs from power (radiant flux), which encompasses all electromagnetic waves emitted, including no ...
from 39 7kW xenon lamps into a beam of about 9,129,000,000
candela The candela (symbol: cd) is the unit of luminous intensity in the International System of Units (SI). It measures luminous power per unit solid angle emitted by a light source in a particular direction. Luminous intensity is analogous to radi ...
. ''
Tribute in Light The ''Tribute in Light'' is an art installation created in remembrance of the September 11 attacks. It consists of 88 vertical searchlights arranged in two columns of light to represent the Twin Towers. It stands six blocks south of the Wor ...
'' is an art installation that uses two columns of searchlights to represent the former Twin Towers of the World Trade Center, in remembrance of the
September 11 attacks The September 11 attacks, also known as 9/11, were four coordinated Islamist terrorist suicide attacks by al-Qaeda against the United States in 2001. Nineteen terrorists hijacked four commercial airliners, crashing the first two into ...
. It is produced annually in
Lower Manhattan Lower Manhattan, also known as Downtown Manhattan or Downtown New York City, is the southernmost part of the Boroughs of New York City, New York City borough of Manhattan. The neighborhood is History of New York City, the historical birthplace o ...
. Disney parks uses searchlights in their nighttime fireworks displays. They are installed on top of the rooftops of several attractions in
Fantasyland Fantasyland is one of the "themed lands" at all of the Disneyland-style parks run by The Walt Disney Company around the world. It is themed after List of Disney animated films based on fairy tales, Disney's animated fairy tale feature films. Ea ...
. File:Searchlights at the W at Bonifacio High Street, Manila.JPG, Searchlights at
New Year's Eve In the Gregorian calendar, New Year's Eve refers to the evening, or commonly the entire day, of the last day of the year, 31 December, also known as Old Year's Day. In many countries, New Year's Eve is celebrated with dancing, eating, drinkin ...
2012 in Bonifacio Global City, Philippines File:LuminatoatHarbourfront.jpg, Use of searchlights at the
Luminato The Luminato Festival, Toronto's International Festival of Arts and Ideas, is an annual celebration of the arts in Toronto, Ontario, Canada, launched in 2007. In its first decade, Luminato presented over 3,000 performances featuring 11,000 artist ...
arts festival in Toronto File:Tokyo sky tree23.jpg, Searchlights demonstrating the height of
Tokyo Skytree , also written as Tokyo Sky Tree, is a broadcasting and observation tower, located in Sumida, Tokyo, Japan. It has been the tallest tower in Japan since opening in 2012,
before its construction in 2007 File:Light beam, Luxor, Las Vegas (6433695339).jpg, Luxor Sky Beam File:September_11th_Memorial_Tribute_In_Light_2014.jpg,
Tribute in Light The ''Tribute in Light'' is an art installation created in remembrance of the September 11 attacks. It consists of 88 vertical searchlights arranged in two columns of light to represent the Twin Towers. It stands six blocks south of the Wor ...
, representing the World Trade Center twin towers in remembrance of the September 11 attacks File:20th Century-Fox fanfare 1947.webm, Animated searchlights are a part of the distinctive
production logo A production logo, studio logo, vanity card, vanity plate, or vanity logo is a logo used by Film studio, movie studios and television production company, production companies to brand what they produce and to determine the production company an ...
used at the start of
20th Century Fox 20th Century Studios, Inc., formerly 20th Century Fox, is an American film studio, film production and Film distributor, distribution company owned by the Walt Disney Studios (division), Walt Disney Studios, the film studios division of the ...
films since the 1930s File:KLJB 2016 logo.png, A logo for
Fox Foxes are small-to-medium-sized omnivorous mammals belonging to several genera of the family Canidae. They have a flattened skull; upright, triangular ears; a pointed, slightly upturned snout; and a long, bushy tail ("brush"). Twelve species ...
affiliate
KLJB KLJB (channel 18) is a television station licensed to Davenport, Iowa, United States, serving as the Fox affiliate for the Quad Cities area. It is owned by Mission Broadcasting, which maintains a shared services agreement (SSA) with Nexsta ...
, one of many examples of a Fox station still using searchlights in their logo.


See also

*
Mangin mirror In optics, a Mangin mirror is a negative meniscus lens with the reflective surface on the rear side of the glass forming a curved mirror that reflects light without spherical aberration if certain conditions are met. This reflector was invented i ...
*
Cathedral of light The Cathedral of Light or ''Lichtdom'' was a main aesthetic feature of the Nuremberg Rallies, Nazi Party rallies in Nuremberg from 1934 to 1938. Designed by architect Albert Speer, it consisted of 152 anti-aircraft searchlights, at intervals of ...
* ''
Tribute in Light The ''Tribute in Light'' is an art installation created in remembrance of the September 11 attacks. It consists of 88 vertical searchlights arranged in two columns of light to represent the Twin Towers. It stands six blocks south of the Wor ...
'' * Military applications of searchlight **
Canal Defence Light The Canal Defence Light (CDL) was a British "secret weapon" of the Second World War, based upon the use of a powerful arc lamp, carbon-arc searchlight mounted on a tank. It was intended to be used during night-time attacks, when the light would a ...
**
Turbinlite The Helmore/ GEC Turbinlite was a 2,700 million candela (2.7 Gcd) searchlight fitted in the nose of a number of British Douglas Havoc night fighters during the early part of the Second World War and around the time of The Blitz. The ...
**
Leigh light The Leigh Light (L/L) was a British World War II era anti-submarine device used in the Battle of the Atlantic. It was a powerful (22 million candelas) carbon arc searchlight of diameter fitted to a number of the British Royal Air Force' ...
**
G-numbers This is the Group G series List of the United States military vehicles by (Ordnance) supply catalog designation, – ''one'' of the alpha-numeric "standard nomenclature lists" (SNL) that were part of the overall list of the United States Army ...
**
German searchlights of World War II German searchlights of the Second World War were used to detect and track enemy aircraft at night. They were used in three main sizes, 60, 150 and 200 centimetres. After the end of the First World War, German development of searchlights was effectiv ...


References


Citations


Sources

* FM 4-29 seacoast searchlights
FM 4-111
Coast Artillery Field Manual, Antiaircraft Artillery, Position Finding and Control, Antiaircraft Search-lights (US War Department, 1940) * FM 4-115


External links





Information on a website commemorating the US 225th AAA Searchlight Battalion
"Giant Lights Paint The Sky To Work New Magic"
July ''Popular Mechanics''—i.e. early article on one of the first commercial use of searchlights. * director restore



a 1943 article from the U.S. War Dept. {{Authority control Types of lamp Articles containing video clips