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 reflector used to collect and direct the light through a barrel that contains a lens or lens train. The optics of an ERS instrument are roughly similar to those of a 35 mm slide projector. There are many types of ERS that are designed for the myriad applications found in the entertainment industry. ERS instruments come in all shapes and sizes. Each particular model of ERS has its own set of characteristics. Generally, ERS instruments are the most varied and utilized type of stage lighting instrument. ERS may also be referred to as Profile Spotlights (especially in Europe) because the beam can be shaped to the profile of an object. Ellipsoidal reflectors are used for their strong, well-defined light and their versatility. '' Leko'' and ''Source Four'' are brand names which are often, but inaccurately, used to ...
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Leko
Leko may refer to: * Leko (surname) * Leko languages, a small group of African Savanna languages * Leco language, a moribund isolate language of Bolivia * Lekolite or Leko, a type of stage spotlight * Alexandro da Silva Santos or Leko, Brazilian footballer * Leko (Arnarvon Islands), a minor island in the Arnarvon Islands See also * Lekos (Dagestan), the ancestor-eponym of the Lek tribe of the North Caucasus * Lecco Lecco (, , ; lmo, label= Lecchese, Lècch ) is a city of 48,131 inhabitants in Lombardy, northern Italy, north of Milan. It lies at the end of the south-eastern branch of Lake Como (the branch is named ''Branch of Lecco'' / ''Ramo di Lecco'') ...

Electrical Filament
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a wire filament heated until it glows. The filament is enclosed in a glass bulb with a vacuum or inert gas to protect the filament from oxidation. Current is supplied to the filament by terminals or wires embedded in the glass. A bulb socket provides mechanical support and electrical connections. Incandescent bulbs are manufactured in a wide range of sizes, light output, and voltage ratings, from 1.5 volts to about 300 volts. They require no external regulating equipment, have low manufacturing costs, and work equally well on either alternating current or direct current. As a result, the incandescent bulb became widely used in household and commercial lighting, for portable lighting such as table lamps, car headlamps, and flashlights, and for decorative and advertising lighting. Incandescent bulbs are much less efficient than other types of electric lighting, converting ...
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Lighting Designer
In theatre Theatre or theater is a collaborative form of performing art that uses live performers, usually 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 perfor ..., a lighting designer (or LD) works with the director, choreographer, set designer, costume designer, and sound designer to create the lighting, atmosphere, and time of day for the production in response to the text while keeping in mind issues of visibility, safety, and cost. The LD also works closely with the stage manager or show control programming, if show control systems are used in that production. Outside stage lighting, the job of a lighting designer can be much more diverse, and they can be found working on rock and pop tours, corporate launches, art installations, or lighting effects at sporting events. During pre-production The role of the lighting designer varies greatly within professional and am ...
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Stage Lighting Instrument
Stage lighting instruments (lanterns, or luminaires in Europe) are used in stage lighting to illuminate theatre, theatrical productions, concerts, and other performances taking place in live performance Theater (structure), venues. They are also used to light television studios and sound stages. 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 m ...
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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 Design Principle and Process Several different types of s are used in this discipline.
theatrecrafts' Types of Lanterns. In addition to basic lighting, modern stage lighting can also include special effects, such as
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Leko Lite
Leko may refer to: * Leko (surname) * Leko languages, a small group of African Savanna languages * Leco language, a moribund isolate language of Bolivia * Lekolite or Leko, a type of stage spotlight * Alexandro da Silva Santos or Leko, Brazilian footballer * Leko (Arnarvon Islands), a minor island in the Arnarvon Islands See also * Lekos (Dagestan), the ancestor-eponym of the Lek tribe of the North Caucasus * Lecco Lecco (, , ; lmo, label= Lecchese, Lècch ) is a city of 48,131 inhabitants in Lombardy, northern Italy, north of Milan. It lies at the end of the south-eastern branch of Lake Como (the branch is named ''Branch of Lecco'' / ''Ramo di Lecco'') ...

Altman Lighting Co
Altman may refer to: * Altman (surname) * Altman (automobile), Ohio-based manufacturer * ''Altman'' (film), a 2014 documentary film about film director Robert Altman * Altman Lighting Co., American lighting manufacturer * Altman, Colorado, a ghost town * Altman, West Virginia See also * Altmann (other) Altmann may refer to: * Altmann (surname) * Altmann (mountain), a summit of the Appenzell Alps * Altmann of Passau, bishop (1020–1091) * Altmann (1905 automobile), an early German automobile * ''Republic of Austria v. Altmann'', a decision by the ...

Cold Mirror
A cold mirror is a specialized dielectric mirror, a dichroic filter, that reflects the entire visible light spectrum while very efficiently transmitting infrared wavelengths. Similar to hot mirrors, cold mirrors can be designed for an incidence angle ranging between zero and 45 degrees, and are constructed with multi-layer dielectric coatings, in a manner similar to interference filters. Cold mirrors can be employed as dichroic beamsplitters with laser systems to reflect visible light wavelengths while transmitting infrared. See also *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 ... Mirrors {{optics-stub ...
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McGraw Hill
McGraw Hill is an American educational publishing company and one of the "big three" educational publishers that publishes educational content, software, and services for pre-K through postgraduate education. The company also publishes reference and trade publications for the medical, business, and engineering professions. McGraw Hill operates in 28 countries, has about 4,000 employees globally, and offers products and services to about 140 countries in about 60 languages. Formerly a division of The McGraw Hill Companies (later renamed McGraw Hill Financial, now S&P Global), McGraw Hill Education was divested and acquired by Apollo Global Management in March 2013 for $2.4 billion in cash. McGraw Hill was sold in 2021 to Platinum Equity for $4.5 billion. Corporate History McGraw Hill was founded in 1888 when James H. McGraw, co-founder of the company, purchased the ''American Journal of Railway Appliances''. He continued to add further publications, eventually establishin ...
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Focal Length
The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a system converges light, while a negative focal length indicates that the system diverges light. A system with a shorter focal length bends the rays more sharply, bringing them to a focus in a shorter distance or diverging them more quickly. For the special case of a thin lens in air, a positive focal length is the distance over which initially collimated (parallel) rays are brought to a focus, or alternatively a negative focal length indicates how far in front of the lens a point source must be located to form a collimated beam. For more general optical systems, the focal length has no intuitive meaning; it is simply the inverse of the system's optical power. In most photography and all telescopy, where the subject is essentially infinitely far away, longer focal length (lower ...
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