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Stage lighting instruments (lanterns, or luminaires in Europe) are used in
stage lighting Stage lighting is the craft of lighting as it applies to the production of theater, dance, opera, and other performance arts.
stage lighting
to illuminate
theatrical
theatrical
productions,
concert A concert is a live music performance in front of an audience. The performance may be by a single musician, sometimes then called a recital, or by a musical ensemble, such as an orchestra, choir, or musical band, band. Concerts are held in a w ...

concert
s, and other
performance A performance is an act of staging or presenting a play, concert, or other form of entertainment. It is also defined as the action or process of carrying out or accomplishing an action, task, or function. Management science In the work place ...

performance
s taking place in live performance
venues Venue is the location at which an event takes place. It may refer to: Locations * Venue (law), the place a case is heard * Financial trading venue, a place or system where financial transactions can occur * Music venue, place used for a concer ...
. They are also used to light
television studio A television studio, also called a television production studio, is an installation room in which video productions take place, either for the production of live television and its recording onto video tape or other media such as SSDs, or for t ...

television studio
s and
sound stage A sound stage (also written soundstage) is a soundproof, large structure, building, or room with large doors and high ceilings, used for the production of theatrical film-making and television productions, usually located on a secured movie stu ...
s. Many stagecraft terms vary between the United States and the United Kingdom. In the United States, lighting fixtures are often called "instruments" or "units". In the UK, they are called "lanterns" or "luminaires". This article mainly uses terms common to the United States.


Components

:''See the picture at the top of the page for the physical location of most components.'' Stage lighting instruments all have the following components:


Housing

The lamp housing is a metal or plastic container that serves as a body for the entire instrument and prevents light from spilling in unwanted directions. It comprises all of the exterior of the fixture except for the lens or opening. The housing may be designed with specific elements that help reduce heat and increase the efficiency of a lamp. Older instruments were made from
rolled Rolling is a Motion (physics)#Types of motion, type of motion that combines rotation (commonly, of an Axial symmetry, axially symmetric object) and Translation (geometry), translation of that object with respect to a surface (either one or the ot ...
and machined steel or aluminum. With the advent of the Source Four, many lighting instruments are being made from die cast metal. Die casting allows for one single, light-weight body that is more economical to produce and use. The first lantern to make use of die castings was the Strand Pattern 23 designed by Fred Bentham in 1953, this small mirror spot enjoyed a 30-year production run and found its way into many British schools, halls and theaters. Some instruments are made from plastic, such as the Selecon Pacific.


Lens or opening

The opening is the gap in the housing from where the beam of light is intended to come. Many fixtures use a
lens A lens is a transmissive optics, optical device which focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a #Compound lenses, compound lens consists of several simp ...

lens
to help control the beam of light, though some, such as border or
cyclorama A cyclorama is a panoramic image An image is a visual representation of something. It can be two-dimensional, three-dimensional, or somehow otherwise feed into the visual system to convey information. An image can be an artifact, such ...
lights, do not have any lenses or optics other than the reflector. The lens and the reflector, along with other beam-altering devices, are both considered part of the optics system. There are two main lens types. Profile Lens Systems and Wash Lens Systems. Instruments with profile lens systems usually have a beam that is narrow and hard edged. ERS lights and follow spots use these lenses. On the other hand, fixtures such as PAR's and Fresnels use wash lens systems. The wash lens system casts a diffused wash of light with a softer beam edge.


Reflector

The reflector affects the quality and directionality of the light output. A reflector is located behind or around the light source in such a way as to direct more light towards the lens or opening. Each unit has a characteristic reflector, used in conjunction with the lens (or lack thereof) to create the desired effect. An ellipsoidal reflector has a lamp set at one focus point of an ellipsoid-shaped reflector that bounces the light and focuses it at the second focus point of the ellipse. This focuses the beam of light into a tight beam. Ellipsoidal reflectors often are used for tight, focusable spots, although they can be used for
floodlights A floodlight is a broad-beamed, gas discharge lamp#High-intensity discharge lamps, high-intensity artificial light. They are often used to illuminate outdoor playing fields while an outdoor sports event is Night game, being held during low-li ...

floodlights
, such as in scoops (see below). A parabolic reflector has a lamp set at the focus point of a parabola-shaped reflector that bounces the light in parallel beams away from the reflector. There is no point at which the light converges, so the light is unfocusable. Parabolic reflectors are used for lights intended to provide an unfocused wash, such as PAR cans. Reflectors can also be used to selectively reduce or eliminate unwanted thermal emission. Incandescent lamps produce light through heating of the filament, while arc lamps produce light through the heating and ionization of a gas. In either case, this heat is also emitted from the lamp as infrared light. The thermal energy is often projected onto the stage with the visible light, and thousands of watts of incandescent lighting can be uncomfortably hot for the actors on stage. Specially designed reflectors are able to absorb and dissipate infrared at the fixture before the visible light reaches the stage.


Yoke

Most instruments are suspended or supported by a U-shaped yoke, fixed at two points to the sides of the instrument, providing an
axis of rotation Rotation around a fixed axis is a special case of rotational motion. The fixed-Cartesian coordinate system, axis hypothesis excludes the possibility of an axis changing its orientation and cannot describe such phenomena as nutation, wobbling or ...
. The base of the yoke is typically a single bolt around which the yoke can be rotated, providing a second axis of rotation. Combined, these two axis allow the fixture to point nearly anywhere in a spherical
range of motion Range of motion (or ROM), is the linear or angular distance that a moving object may normally travel while properly attached to another. It is also called range of travel (or ROT), particularly when talking about mechanical devices and in mechanic ...
encircling the yoke. The yoke is connected to a pipe or
batten A batten is most commonly a strip of solid material, historically wood but can also be of plastic, metal, or fiberglass. Battens are variously used in construction, sailing, and other fields. In the lighting industry, battens refer to linea ...
by one of the clamps mentioned below. It may also be affixed to the deck with floor mounts, or attached to the set with a stage screw. Some yokes are motorized, allowing remote control systems to change where a fixture is pointing during a show.


Attachment apparatus

C-Clamps are hook clamps that use a threaded bolt to attach to a pipe or batten and to hold the instrument secure. Once secured, the fixture can be panned and tilted using adjustment knobs on the yoke and clamp. In addition, safety cables (a loop of aircraft cable terminated with
carabiner A carabiner or karabiner () is a specialized type of shackle, a metal loop with a spring-loaded gate used to quickly and reversibly connect components, most notably in safety-critical systems. The word is a shortened form of ''Karabinerhaken'' ...

carabiner
s) are used to support the lighting instrument in case the clamp fails. A side arm is a metal pole bolted to the instrument with a clamp on the end. This enables the instrument to be hung to the side of an electric as opposed to below it.


Lamp or arc source

All instruments need some type of source to produce light. The bulbs used are referred to as lamps. Stage lighting instruments typically use incandescent lamps, tungsten-halogen lamps, encapsulated arcs, or LEDs. Most theatrical lamps are tungsten-halogen (or quartz-halogen), an improvement on the original
incandescent Incandescence is the emission of electromagnetic radiation In physics, electromagnetic radiation (EMR) consists of waves of the electromagnetic field, electromagnetic (EM) field, which propagate through space and carry momentum and electr ...

incandescent
design that used halogen gas instead of an inert gas.
Fluorescent Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation. It is a form of luminescence. In most cases, the emitted light has a longer wavelength, and therefore a lower photon energy, tha ...

Fluorescent
lights are rarely used other than as work lights (see below). Although they are far more efficient, they cannot be '' dimmed'' (run at less than full power) without using specialized dimmers, cannot dim to very low levels, do not produce light from a single point or easily concentrated area, and have a warm-up period during which they emit no light or do so intermittently.
High-intensity discharge lamp High-intensity discharge lamps (HID lamps) are a type of Electric light, electrical gas-discharge lamp which produces light by means of an electric arc between tungsten electrodes housed inside a translucent or transparent fused quartz or fused ...
s (or HID lamps) are now common where a very bright light output is required, for example in large s, HMI ( hydrargyrum medium-arc iodide) floods, and modern automated fixtures. Because these types of lamps cannot be electrically dimmed, dimming is done by mechanical dousers or shutters that physically block portions of the lamp to decrease output. Some specially-designed fittings now use
light-emitting diodes A light-emitting diode (LED) is a semiconductor Electronics, device that Light#Light sources, emits light when Electric current, current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy i ...
(LEDs) as a light source. LEDs are ideal where an intense but unfocused light source is required, such as for lighting a cyclorama. LEDs have now been added to fixtures such as the Source Four LED, which looks similar to the source four onstage, but is controlled with LEDs. Incandescent lamps are most likely the type of light one is used to seeing. They are typical household lights that are usually between 40 and 100 watts. However, the US has been taking them out of production due to their inefficient nature. Typically, an incandescent lamp has a tungsten filament surrounded by an inert gas. This is all encapsulated by a bulb. The inert gas stops the formation of anything that could darken the bulb, such as carbon. The bulb is usually made from Pyrex or synthetic quartz. Incandescent lamps also have a base. The base screws into a socket and serves as an electrical contact point for the socket and the filament inside. For the most part, higher watt bulbs will use larger bases. Incandescent bulbs for stage lighting may have pins on the bottom instead of a screw. This allows them to be positioned properly in relation to a reflector. The filament of the lamp is usually tightly coiled tungsten wire. Tungsten-Halogen lamps, or T-H lamps, are similar to incandescent bulbs, but instead of an inert gas being used, a halogen gas is used. Halogens are chemically active. Therefore, when the filament releases tungsten particles, the halogen gas forms a compound with them that the filament attracts back. The particles of tungsten then attach to the filament again. Because of this, there are less tungsten deposits on the bulb and the filament is constantly rebuilt, and so the light lasts much longer than a typical incandescent light. LEDs are of an advantage because they are available in many colors today. LEDs are semiconducting diodes that emit light. The chemical composition of the LED determines the color of the light. Unlike conventional fixtures, LEDs do not need dimmers, but have intensities controlled by wattage. LED lights are much more energy efficient than incandescent or T-H lamps. While a household incandescent may be rated for 100 watts, an LED of the same intensity could be under 15 watts. One of their advantages to T-H and incandescent bulbs is that they do not require colored gels. LED fixtures typically come with multiple colors of LED lights.
Color theory In the visual arts, color theory is the body of practical guidance for color mixing and the visual effects of a specific color combination. Color terminology based on the color wheel and its geometry separates colors into primary color, seconda ...
shows that mixing the primary colors of light will make white light. Therefore, through color mixing, LED's can form a wide variety of colors from white light to deep primary colors to many others. This reduces the time taken to change the color of an already hung fixture. The introduction of the LED allows much more variety of color and they also require much less power, making them useful to have in a theater or production. Arc Sources produce an electric arc. Electric current moving in the gap between the two electrodes creates a bright blue light. They can typically be found in follow spots and moving fixtured. One of their downsides is that they cannot be dimmed Therefore, the light can either be turned on or off. They can also use mechanical dimmers, such as dousers, that are made with slats or an iris that moves to limit the light leaving the fixture.


Accessories

Conventional (non- intelligent) fixtures are designed to accept a number of different accessories intended to assist in the modification of the output. The most common, found on almost all stage lights, is the gel frame holder. The gel frame holder is intended to hold gel, mounted in cardboard or metal gel frames. Other common accessories include gobo holders or rotators, holders, , barn doors and color scrollers. Gobos are templates made from a thin piece of metal that have designs to project patterns. An Iris is an accessory which can alter the size of the projected beam of light. Color scrollers hold a spool of color media that have been attached to each other. It can then scroll through the gels to change the color.


Transaction

Lighting instruments can be broadly separated into two categories: ''
floodlights A floodlight is a broad-beamed, gas discharge lamp#High-intensity discharge lamps, high-intensity artificial light. They are often used to illuminate outdoor playing fields while an outdoor sports event is Night game, being held during low-li ...

floodlights
'', which illuminate a wide area, and ''spotlights'' (sometimes known as ''profiles''), which produce a narrower, more controllable
light beam A light beam or beam of light is a directional projection of light energy radiating from a list of light sources, light source. Sunlight forms a light beam (a sunbeam) when filtered through media such as clouds, foliage, or windows. To artific ...
. The distinction has to do with the characteristics of the light produced by the instrument. Spotlights produce a potentially tightly focused light, while floodlights produce a much more diffuse light. Instruments that fall somewhere in the middle of the spectrum can be classified as either a spot or a flood, depending on the type of instrument and how it is used.


Stagelights


PAR lights

Parabolic Aluminized Reflector lights, or PAR lights, or PAR cans, are used when a substantial amount of flat lighting is required for a scene. A PAR can is a
sealed beam A parabolic aluminized reflector lamp (PAR lamp or simply PAR) is a type of electric lamp that is widely used in commercial, residential, and transportation illumination. It produces a highly directional beam. Usage includes theatrical lightin ...
PAR lamp housed in a simple can-like unit. Like an old-fashioned automotive headlight, the reflector is integral to the lamp and the beam spread of the unit is not adjustable except by changing the lamp. PAR lamps are widely used in architectural lighting and may often be found at hardware stores. PAR lights have seen heavy use in
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shows, especially those with smaller budgets, due to their low cost, light weight, easy maintenance, high durability, and high output. They are often used in combination with
smoke Smoke is a suspension of airborne particulates and gases emitted when a material undergoes combustion or pyrolysis, together with the quantity of air that is entrainment (engineering), entrained or otherwise mixed into the mass. It is commo ...
or haze machines which make the path of the beam visible. They are also often used as top, back, or side lights in the theatre and for special effects. All PAR lamps except those with narrow or very narrow lenses produce an intense
oval An oval () is a closed curve in a plane (geometry), plane which resembles the outline of an egg. The term is not very specific, but in some areas (projective geometry, technical drawing, etc.) it is given a more precise definition, which may inc ...

oval
pool of light, some with fixed focus and soft edges. In order to adjust the orientation of the oval, the lamp must be rotated. The number associated with a PAR light (e.g.: Par 64, Par 36, Par 16) indicates the diameter of the
lamp Lamp, Lamps or LAMP may refer to: Lighting * Oil lamp An oil lamp is a lamp used to produce light continuously for a period of time using an oil-based fuel source. The use of oil lamps began thousands of years ago and continues to this da ...
in eighths of an inch. Four different beam angles can be obtained on the PAR-64. The beam angle is determined by the lamp. Lamps come in "very narrow" (6° x 12°), "narrow" (7° x 14°), "medium" (12° x 28°), and "wide" (24° x 48°). Each angle has two numerical values since the beams are elliptical rather than circular. PAR 16s are often referred to as "birdies". ''PAR-bars'' are aluminum pipes with par cans permanently attached and circuited through the pipe. Par-bars with 4 instruments are often referred to as ''4-bars'', and par-bars with 6 instruments are referred to as ''6-bars''. In 1995 Electronic Theatre Controls (ETC) introduced the Source Four PAR as an alternative to PAR cans . The Source Four PAR is similar to the PAR can, but it has differences as well. Unlike the PAR can, the Source Four PAR does not have a movable parabolic reflector. Also, instead of using a PAR lamp, it uses the same lamps as the Source Four Ellipsoidals. Additionally, the Source Four PAR uses changeable lenses that affect the beam.


Strip lights

Strip lights, also known as cyclorama or cyc lights (thus named because they are effective for lighting the
cyclorama A cyclorama is a panoramic image An image is a visual representation of something. It can be two-dimensional, three-dimensional, or somehow otherwise feed into the visual system to convey information. An image can be an artifact, such ...
, a curtain at the back of the stage), border lights, and codas (by the brand name), are long housings typically containing multiple lamps arranged along the length of the instrument and emitting light perpendicular to its length. Lamps are often covered with
gels A gel is a Quasi-solid, semi-solid that can have properties ranging from soft and weak to hard and tough. Gels are defined as a substantially dilute cross-linked system, which exhibits no flow when in the steady-state, although the liquid phase ...
of multiple colors (often red, green, and blue, which, in theory, allow almost any color to be mixed) with each color controlled by a separate electrical dimmer circuit. Many striplights use round pieces of glass (called ''roundels'') rather than plastic gels for color. Roundels can sustain heavy use for a long time without fading and are often found in more permanent installations.


Scoop lights

Scoop lights or scoops are circular fixtures that do not have any lenses. They have an ellipsoidal reflector at the back of the fixture that directs the light out of the fixture. Since they do not have any sort of lens system they are cheaper than other fixtures. However, the light cannot be focused at all (even PARs allow more control than scoops). Scoops are most often used to flood the stage with light from above, or to light backdrops. Scoops can have gels affixed. Occasionally they are used as work lights (see below).


House lights and worklights

House lights provide light on the theater's seats and aisles for the
audience An audience is a group of people who participate in a show or encounter a work of art, literature (in which they are called "readers"), theatre, music (in which they are called "listeners"), video games (in which they are called "players"), or ...

audience
before and after performances and during
intermission An intermission, also known as an interval in British and Indian English, is a recess between parts of a performance or production, such as for a play (theatre), theatrical play, opera, concert, or film screening. It should not be confused with ...

intermission
s. They are generally incandescent lights, however fluorescent lights or scoops may be used in some instances. House lights are often controlled by
dimmer A dimmer is a device connected to a light fixture and used to lower the brightness of the lighting, light. By changing the voltage waveform applied to the lamp, it is possible to lower the luminous intensity, intensity of the light output. Alt ...
s, but are sometimes on simple switches. Worklights provide general lighting backstage or in the
house A house is a single-unit residential building. It may range in complexity from a rudimentary hut to a complex structure of wood, masonry, concrete or other material, outfitted with plumbing, electrical, and heating, ventilation, and air condit ...
, and are often fluorescent fixtures. Work lights are almost always non-dimmed. House and work lights are usually off during performances but are occasionally included in the lighting design to establish focus or emphasize plot elements. When the house lights are not on a dimmer, the switch is usually under the control of the stage manager.


LED stage lights

LED stage lighting instruments are stage lighting instruments that use
light-emitting diode A light-emitting diode (LED) is a semiconductor Electronics, device that Light#Light sources, emits light when Electric current, current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy i ...
s (LEDs) as a light source. LED instruments are an alternative to traditional stage lighting instruments which use
halogen lamp A halogen lamp (also called tungsten halogen, quartz-halogen, and quartz iodine lamp) is an Incandescent light bulb, incandescent lamp consisting of a tungsten filament sealed in a compact transparent envelope that is filled with a mixture of ...
or
high-intensity discharge lamp High-intensity discharge lamps (HID lamps) are a type of Electric light, electrical gas-discharge lamp which produces light by means of an electric arc between tungsten electrodes housed inside a translucent or transparent fused quartz or fused ...
s. Like other LED instruments, they have high light output with lower power consumption. Most LED fixtures use three or more colors (usually red, green, and blue) which can be mixed to hypothetically create any color.


=Types

= LED stage lights come in four main types. , spotlights, striplights, and " moving head" types. In LED PAR cans, a round printed circuit board with LEDs mounted on is used in place of a PAR lamp. Moving head types can either be a bank of LEDs mounted on a yoke or more conventional moving head lights with the bulb replaced with an LED bank.


=Uses

= LED instruments can and have been used to replace any conventional lighting fixture, and some shows, such as
Radiohead Radiohead are an English rock band formed in Abingdon-on-Thames, Abingdon, Oxfordshire, in 1985. The band consists of Thom Yorke (vocals, guitar, piano, keyboards); brothers Jonny Greenwood (lead guitar, keyboards, other instruments) and Colin ...

Radiohead
's recent tour, have used only LED lighting instruments. Most shows use LEDs only for lighting cycloramas, or as top, side, or back light due to their low throw distance. They can also be used as ''audience blinders'' (lights pointed directly at the audience from a low angle).


Spotlights

A spotlight is any lighting instrument used in
theater Theatre or theater is a collaborative form of performing art that uses live performers, usually actor, actors or actresses, to present the experience of a real or imagined event before a live audience in a specific place, often a stage. The p ...

theater
to create a pool of light on the
stage Stage or stages may refer to: Acting * Stage (theatre), a space for the performance of theatrical productions * Theatre, a branch of the performing arts, often referred to as "the stage" * ''The Stage'', a weekly British theatre newspaper * Sta ...
. There are many different types of spotlights which break down into three general areas: *
Fresnel lantern A Fresnel lantern (pronounced ''frəˈnɛl or fruh-nel'') is a common Stage lighting instrument, lantern used in theatre that employs a Fresnel lens to wash light over an area of the stage (theatre), stage. The lens produces a wider, soft-edged bea ...
s or Fresnels (US) are small fixtures giving a soft-edged spot or pool of light. Their name comes from the distinctive ridged Fresnel lens used on the front. * Profile spots (UK) or
ellipsoidal reflector spotlight Ellipsoidal reflector spot (abbreviated to ERS, or colloquially ellipsoidal or ellipse) is the name for a type of stage lighting instrument, named for the ellipsoidal mirror, reflector used to collect and direct the light through a barrel (di ...
s (US) tend to be longer fixtures containing convex lenses and having a ''gate'' at their focal point which enables the insertion of '' gobos'' or ''irises'' to shape the beam of light. They give a hard-edged beam most often associated in the public mind with "spotlights". Large versions are operated by a
technician A technician is a worker in a field of technology who is proficient in the relevant skill and technique, with a relatively practical understanding of the theoretical principles. Specialisation The term technician covers many different speciali ...
as a '
followspot {{Unreferenced, date=October 2007 A spotlight (or followspot) is a powerful stage lighting instrument which projects a bright beam of light onto a performance space. Spotlights are controlled by a spotlight operator who tracks actors around th ...
' to follow performers on the stage. The term Profile Spot used in the UK refers to a focussing spotlight which may, or may not use the ellipsoidal reflector design, this design was not common in the UK until the 1970s and many UK and European manufacturers have still to adopt this design instead preferring a twin PC lens design. * Pebble Convex lanterns (or "PCs") are similar to Fresnels, but use a plano-convex lens with a pebbled effect on the planar (flat) side, resulting in less "spill" outside the main beam. They are used much more widely in Europe than North America.


Fresnel lantern

A Fresnel lantern (UK), or simply Fresnel (US), employs a
Fresnel lens A Fresnel lens ( ; ; or ) is a type of composite compact lens (optics), lens developed by the French physicist Augustin-Jean Fresnel (1788–1827) for use in lighthouses. It has been called "the invention that saved a million ships." The desi ...

Fresnel lens
to wash light over an area of the stage. The lens is named after French physicist
Augustin-Jean Fresnel Augustin-Jean Fresnel (10 May 1788 – 14 July 1827) was a French civil engineer and physicist whose research in optics led to the almost unanimous acceptance of the wave theory of light, excluding any remnant of Isaac Newton, Newton's co ...
, and consequently pronounced with a silent "s". The distinctive lens has a 'stepped' appearance instead of the 'full' or 'smooth' appearance of those used in other lanterns. The resulting beam of light is wide and soft-edged, creating soft
shadow A shadow is a dark area where light from a light source is blocked by an opaque object. It occupies all of the three-dimensional volume behind an object with light in front of it. The cross section of a shadow is a two- dimensional silhouet ...

shadow
s, and is commonly used for back light, top light, and side light. Another method of controlling the spread of light is to use either a
top hat A top hat (also called a high hat, a cylinder hat, or, informally, a topper) is a tall, flat-crowned hat for men traditionally associated with formal wear in Western dress codes, meaning white tie, morning dress, or frock coat. Traditionally m ...

top hat
(also referred to as a snoot), which generally limits the light coming out, or a
barn door Stage lighting accessories are components manufactured for conventional (non-intelligent lighting, automated) stage lighting instruments. Most conventional fixtures are designed to accept a number of different accessories designed to assist in the m ...
, whose flaps work as though they were shutters on an ERS (shown on the right). These methods limit light output and keep excess light from spilling into the eyes of audience members or where it is not desired. Fresnels use a spherical reflector, with the lamp at the focus point. The lamp and reflector remain a fixed unit inside the housing, and are moved forward and back to focus the light. This is accomplished using a slider on the bottom or side of the lantern, or using a worm track. At very tight focus, the lanterns are the least efficient, as the least light can escape the housing. Therefore, Fresnels are not good for tight focus on small areas. They are most often used at medium distances from the stage for area lighting. In 1999, ETC introduced a new lighting fixture, the Source Four PARNel, which combined the design of the PAR fixture with that of the Fresnel. The fixture is more versatile, allowing for a flood or a softer spot.


Ellipsoidal reflector spotlight

The ellipsoidal reflector spotlight (ERS), also known as profile (after its ability to project the silhouette or profile of anything put in the gate) (UK) and Découpe (French), is the most abundant instrument type currently in theatrical use. The flexibility of the ERS allows it to fulfill the bulk of lighting roles in the theater. They are sometimes known as a ''profile spotlight'' (in Europe) or by their brand names, especially the '' Source Four'' (a popular lantern from ETC) and 2 the ''Leko'' (short for '' Lekolite'', from Strand lighting). The major components of an ERS light are the casing in which the internal parts are mounted, an
ellipsoid An ellipsoid is a surface that may be obtained from a sphere by deforming it by means of directional Scaling (geometry), scalings, or more generally, of an affine transformation. An ellipsoid is a quadric surface;  that is, a Surface (mathemat ...

ellipsoid
al reflector located in the back of the casing(truncated conical ellipse), a lamp mounted to position the at the rear focal point of the ellipsoid, a dual plano-convex lens (two plano-convex lenses facing each other in the barrel), and at the front, a gel frame to hold the color gel. The light from the lamp is efficiently gathered by the ellipsoidal reflector and sent forward through the gate, shutters and lens system. The truncated conical ellipse allows better focusing abilities for the light. If the bulb is placed in the first focus, then all light will pass through the second focus at the same time. This creates a very bright beam of light. ERS or profile lanterns have many useful features. One of the most useful are the metal shutters at the focal plane of the lens to shape the beam of light. The original shape of the beam is round, but with the use of the shutters one can limit the beam to avoid obstacles or parts of the set that should not be illuminated in a specific look. Another feature is a gate, also in the focal plane, for sliding in gobos (also known as ''templates'' or ''deckles''). These have patterns cut into them, like a stencil. These patterns are projected onto the stage. An iris also can be inserted in this position to make the beam smaller in diameter, reducing the light cast without the sharp edges of the shutters. ERS instruments from ETC, Altman, Selecon, and a variety of others have interchangeable lens tubes (or ''barrels'') which can both create a very sharp or very soft beam as well as alter the beam spread. The barrel sizes can range from a narrow, long distance 5- or 10-degree spot to a broad and short-distance 50- or even 90-degree. The first 90-degree profile lantern was developed by Selecon Performance Lighting as part of their "Pacific" range of products. Since its introduction many other manufacturers have introduced their own 90-degree barrels. ERS instruments allow many different lens tubes to be used with the same body. This makes them more versatile, since a venue can purchase varying degrees of barrels without buying as many instruments. Many manufacturers also produce zoom lenses which offer the ability to change the beam angle. Some zoom ranges have a poorer optical quality making them difficult to use in sharp focus.


=Field angle

= The field angle of an instrument is the angle of the beam of light where it reaches 10% of the intensity of the center of the beam. Most manufacturers now use field angle to indicate the spread that the fixture has. However, older fixtures are described by the ''width of the lens'' x ''focal length of the instrument''. For example, a 6x9 ellipsoidal would have a 6" lens and a focal length of 9" (creating an approximately 37° beam angle). This nomenclature was used because traditionally a larger lens directly equated with more light output. This is no longer necessarily true, so most manufacturers now identify their fixtures by beam angle and light output. As the field angle narrows, the instrument can either be used further from the stage to create a similarly sized beam as a closer, larger instrument, or it can be used from the same distance to create a smaller beam.


Beam projector

A beam projector is a lensless instrument with very little beam spread. It uses two reflectors. The primary reflector is a parabolic reflector and the secondary reflector is a spherical reflector. The parabolic reflector directs the light into nearly parallel beams, and the spherical reflector is placed in front of the lamp to reflect light from the lamp back to the parabolic reflector, which reduces spill. The result is an intense shaft of light that cannot be easily controlled or modified. The beam projector no longer is used to the extent that it once was, as newer fixtures and PAR lamps have created easier ways to produce the effect.


Followspot

The followspot (also called a ''spotlight'', ''trackspot'', ''lime'' (uk), or ''dome'') is a lighting instrument that is moved during a performance by an operator or by DMX control to provide emphasis or extra illumination and usually to follow a specific performer moving around the stage. Follow spots are commonly used in musical theater and opera to highlight the stars of a performance, but may be used in dramas as well. They are also used in sports venues, as well as many other applications. These lighting instruments come in a variety of sizes with light sources ranging from low power
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incandescent light bulb
s to very powerful
xenon arc lamp A xenon arc lamp is a highly specialized type of gas discharge lamp, an electric light An electric light, lamp, or light bulb is an electrical component that produces light. It is the most common form of artificial lighting. Lamps usual ...
s. 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, ...
spots were common until the 1990s, using the arc between carbon rods as their light source. These follow spots required special installations that include high volume ventilation due to the hazardous fumes produced by the carbon arc. The current generation, xenon, has extremely high internal pressure in the lamp and thus has its own safety concerns. Followspots contain a variety of operator-controlled optical mechanisms. They may include mechanical shutters, which allow the light to be doused without turning off the lamp, lenses to control and focus beam width, and internal
color gel Color (American English) or colour (British English) is the visual perception, visual perceptual Physical property, property deriving from the spectrum of light interacting with the photoreceptor cells of the eyes. Color categories and physica ...
s, often in a color magazine.


Intelligent lighting

Moving lights (or ''intelligent fixtures'') began to gain widespread acceptance in the
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concert
industry in the early 1980s. As the digital age progressed, the cost of these fixtures reduced, and they are increasingly used in many major theatrical productions. Their principal feature is the ability to remotely control the movement and characteristics of the output beam of light. This is achieved by either moving a
mirror A mirror or looking glass is an object that Reflection (physics), reflects an image. Light that bounces off a mirror will show an image of whatever is in front of it, when focused through the lens of the eye or a camera. Mirrors reverse the ...

mirror
which reflects the beam, or by moving the entire fixture, which can pan and tilt by means of a yoke. Usually they also contain other controls to shape, texture and color the light, such as gobo or dichroic wheels. Almost all of the parameters are controlled by step motors. These are capable of very precise movement in either direction that can count a specific number of steps. This allows the fixture to quickly and accurately move. This ability to precisely, and repeatedly set the position of the fixture allows one light to perform many functions, lighting multiple different areas in different ways. They can also move 'live' (with the lamp on), to achieve many of the effects used in modern productions. The majority of intelligent fixtures employ
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, ...
s as a light source, and therefore use a variety of mechanical methods to achieve the effect of dimming. Some fixtures employ standard halogen lamps. Mechanically, stepper motors connected to various internal optical devices (such as gobos and color wheels) manipulate the light before it escapes the fixture's front lens. Discharge fixtures are seeing competitive advantages from the LED industry take place, and many companies are now offering an LED-based intelligent lighting fixture across all arenas of intelligent lighting genre, from wash fixtures to spot fixtures, beam-type fixtures and hybrid units that incorporate two or all of these types. Moving light programs are often much more complex than that of stationary instruments. While it is possible to operate them with any console that uses the DMX512 Protocol, many lighting board operators find a console dedicated to moving light operation to be much more efficient. Oftentimes there will be encoder wheels which will control the Pan, Tilt, Focus, Zoom, Color, and Effects. Many people find visualization software (such as WYSWIG, VectorWorks, and others) to be helpful when programming while other people prefer a hard tactile control. Intelligent lights are used heavily in shows in very large venues, like events in stadiums, where it is very difficult to reach lighting trusses for manual focusing. Although the fixtures may not be moved during the run of the show, they are focused remotely. DMX512 is a standard from the United States Institute for Theatre Technology (USITT). It is a recommended practice to allow lighting systems to "talk." Before DMX512, every manufacturer had its own means of controlling their fixtures. This was inconvenient being that many theatres do not use lights from one single company.


References


External links


Page on lighting instruments

Strand Archive. Information on old lighting instruments
{{Authority control Stage lighting instruments,