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Stage lighting is the craft of lighting as it applies to the production of theater, dance, opera, and other performance arts.[1], Stage Lighting Design Principle and Process Several different types of stage lighting instruments are used in this discipline.[2] theatrecrafts' Types of Lanterns. In addition to basic lighting, modern stage lighting can also include special effects, such as lasers and . People who work on stage lighting are commonly referred to as lighting technicians or lighting designers.
The equipment used for stage lighting (e.g. cabling, dimmers, lighting instruments, controllers) are also used in other lighting applications, including corporate events, concerts, trade shows, broadcast television, film production, photographic studios, and other types of live events. The personnel needed to install, operate, and control the equipment also cross over into these different areas of "stage lighting" applications.
Bloomsbury Methuen ISBN 9780230551909
In England following the Civil War all stage production was suspended in 1642 and no advancements were made to English theaters. During this theatrical famine, great developments were being made in theaters on the European mainland. Charles II, who would later become King Charles II witnessed Italian theatrical methods and brought them back to England when he came to power. New playhouses were built in England and their large sizes called for more elaborate lighting. After the refurbishing of the theaters, it was found that the "main source of light in Restoration theaters to be chandeliers" which were "concentrated toward the front of the house, and especially over the forestage". English theatres during this time used to light chandeliers and sconces. Dipped candles were made by dipping a wick into hot wax repeatedly to create a cylindrical candle. Candles needed frequent trimming and relighting regardless of what was happening on-stage because "they dripped hot grease on both the audience and actors". Chandeliers also blocked the view of some patrons.
There were two different types of Restoration theaters in England: Restoration commercial theaters and Restoration court theaters. Commercial theaters tended to be more "conservative in their lighting, for economic reasons" and therefore used "candle-burning chandeliers" primarily. Court theatres could afford to "use most of the Continental innovations" in their productions. Theaters such as the Drury Lane Theatre and the Covent Garden Theatre were lit by a large central chandelier and had a varying number of smaller stage chandeliers and candle sconces around the walls of the theaters. Two main court theaters, built between 1660 and 1665, were the Cockpit Theatre and the Hall Theatre. Chandeliers and sconces seemed to be the primary lighting sources here but other developments were being made, especially at the Hall. By the 1670s, the Hall Theatre started using footlights, and between 1670 and 1689 they used candles or lamps. It can be noted that by the end of the 17th century, "French and English stages were fairly similar". There is not much written on theatrical lighting in England at the end of the 17th century and from the little information historians do have, not much changed by the middle of the 18th century. Gas lighting hit the English stage in the early 1800s beginning with the Drury Lane and Covent Garden theaters. In the 1820s, a new type of artificial illumination was developed. In this type of illumination, a gas flame is used to heat a cylinder of quicklime (calcium oxide). Upon reaching a certain temperature, the quicklime would begin to incandesce. This illumination could then be directed by reflectors and lenses. It took some time from the development of this new Limelight before it found its way into theatrical use, which started around 1837. Limelight became popular in the 1860s and beyond, until it was displaced by electrical lighting. Lighting advances made in English theaters during this time frame paved the way for the many lighting advances in the modern theatrical world.
Lighting design is an art form, and thus no one way is the "correct" way. There is a modern movement that states that the lighting design helps to create the environment in which the action takes place while supporting the style of the piece. "Mood" is arguable while the environment is essential.
A tungsten lamp's color is typically controlled by inserting one or more gels (filters) into its optical path. In the simplest case, a single gel is inserted into the optical path to produce light of the same color. For example, a blue gel is used to create blue light. Custom colors are obtained by means of subtractive CMY color mixing, by inserting combinations of cyan, magenta and yellow filters into the optical path of the lighting fixture. The inserted filters may have varying densities, with correspondingly varied percentages of transmission, that subtractively mix colors (the filters absorb unwanted light colors, but the desired colors pass through unaffected). Manufacturers will sometimes include an additional green or amber ("CTO" color correction) filter to extend the range (gamut) of subtractive color mixing systems.
Lamp power also influences color in tungsten lamps. As the lamp power is decreased, the tungsten filament in a bulb will tend to produce increasing percentages of orange light, as compared to the nearly white light emitted at full power. This is known as amber shift or amber drift. Thus a 1000-watt instrument at 50 percent power will emit a higher percentage of orange light than a 500-watt instrument operating at full power.
LED fixtures create color through additive color mixing with red, green, blue, and in some cases amber, LEDs at different intensities. This type of color mixing is often used with Striplight and cyclorama lights. [1] Learn Stage Lighting - How do I Use Color Effectively?
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| A gobo of this shape in a fixture with a red gel would produce a pattern like the one shown to the right. | ||
In addition to these, certain modern instruments are automated, referring to motorized movement of either the entire fixture body or the movement of a mirror placed in front of its outermost lens. These fixtures and the more traditional follow spots add direction and motion to the relevant characteristics of light. Automated fixtures fall into either the "moving head" or "moving mirror/scanner" category. Scanners have a body which contains the lamp, circuit boards, transformer, and effects (color, gobo, iris etc.) devices. A mirror is panned and tilted in the desired position by pan and tilt motors, thereby causing the light beam to move. Moving head fixtures have the effects and lamp assembly inside the head with transformers and other electronics in the base or external ballast. There are advantages and disadvantages to both. Scanners are typically faster and less costly than moving head units but have a narrower range of movement. Moving head fixtures have a much larger range of movement as well as a more natural inertial movement but are typically more expensive.
The above characteristics are not always static, and it is frequently the variation in these characteristics that is used in achieving the goals of lighting.
Stanley McCandless was perhaps the first to define controllable qualities of light used in theater. In A Method for Lighting the Stage, McCandless discusses color, distribution, intensity and movement as the qualities that can be manipulated by a lighting designer to achieve the desired visual, emotional and thematic look on stage. The McCandless method, outlined in that book, is widely embraced today. The method involves lighting an object on the stage from three angles—2 lights at 45 degrees to the left and right, and one at 90 degrees (perpendicular to the front of the object).
An alternative formulation is by Jody Briggs, who calls them Variable of Light: Angle, Color, Intensity, Distance, Texture, Edge-quality, Size, and Shape.
A lighting designer must satisfy the requirements set forth by the director or head planner. Practical experience is required to know the effective use of different lighting instruments and color in creating a design. Many designers start their careers as lighting technicians. Often, this is followed by training in a vocational college or university that offers theatre courses. Many jobs in larger venues and productions require a degree from a vocational school or college in theatrical lighting, or at least a bachelor's degree.
In film:
There are a variety of instruments frequently used in the theater. Although they vary in many ways they all have the following four basic components in one form or other:
Most theatrical (or lamps, the term usually preferred) are tungsten-halogen (or quartz-halogen), an improvement on the original incandescent design that uses a halogen gas instead of an inert gas to increase lamp life and output. Fluorescent lights are infrequently used other than as because, although they are far more efficient, they are expensive to make dimmed (run at less than full power) without using specialised dimmer ballasts and only very expensive models will dim to very low levels. They also do not produce light from a single point or easily concentrated area, and usually have a warm-up period, during which they emit no light or do so intermittently.[4] Scenic Art for the Theatre by Susan Crabtree and Peter Beudert. However, fluorescent lights are being used more and more for special effects lighting in theaters. High-intensity discharge lamps (or HID lamps), however, are now common where a very bright light output is required—for example in large follow spots, hydrargyrum medium-arc iodide (HMI) floods, and modern automated fixtures.[5] Interior Graphic Standards by Corky Binggeli and Patricia Greichen p. 558 When dimming is required, it is done by mechanical dousers or shutters, as these types of lamps also cannot be electrically dimmed.
Over the last six years, LED-based luminaires of all varieties and types have been introduced to the market. Some of these fixtures have become very popular, whereas others have not been able to match the output from incandescent and discharge sources that lighting designers prefer. LED fixtures are making a positive impact on the lighting market, and are becoming more popular when compared to the energy usage of current incandescent, halogen, and discharge sources.
Most instruments are suspended or supported by a U-shaped yoke, or 'trunnion arm' fixed to the sides of the instrument, normally near its center of gravity. On the end of such, a clamp (known as a hook-clamp, C-clamp, or pipe clamp—pipe referring to battens) is normally fixed, made in a "C" configuration with a screw to lock the instrument onto the pipe or batten from which it is typically hung. Once secured, the fixture can be panned and tilted using tension adjustment knobs on the yoke and clamp. An adjustable c-wrench, ratchet (US) or spanner (UK) is often used to assist the technician in adjusting the fixture.[6] Stage Lighting Primer
Most venues require an additional metal safety cable or chain to be attached between the fixture and its truss, or other string support anchorage. Some larger fixtures can weigh over and are suspended very high above performers heads, and could cause serious injury or death if they fell by accident or due to incorrect attachment. In the event of failure, the cable would halt the fall of the fixture before it could cause serious damage or injury. Many venues place strict guidelines regarding the use of safety cables. Connecticut College Theater Services Hazard Communication Guide , Please see 'Lights' section.
The entire lighting apparatus includes the lights themselves, the physical structure which supports them, the cabling, control systems, , power supplies, and the . (lighting console)
Hanging the or hanging the battons to hang the lights is known as 'rigging'.
Within the groups of "wash" and "spot" light, there are other, more specific types of fixtures. This nomenclature also changes across the world depending on location and industry.
Traditionally theatre and stage lighting has been of the "generic" type. These are lights which are focussed, geled, and then simply dimmed to give the effect the designer wants. In recent years the emergence of moving lights (or automated lights) has had a substantial impact of theatre and stage lighting.
A typical moving light allows the designer to control the position, color, shape, size and strobing of the light beam created. This can be used for exciting effects for the entertainment or dancefloor use. Moving lights are also often used instead of having a large number of "generic" lights. This is because one moving light can do the work of several generics.
In Australia and many other places, the lamps inside a theatrical fixture are referred to as bubbles. In North American English, a bubble refers to the protrusion that occurs when one's body (or other oily substance) contacts the lamp. Heat will cause the portion of the lamp which has oil on it to expand when it is on creating the bubble, and causing the lamp to explode. That is why one should never directly touch the glass portion of a lamp. Cleaning with rubbing alcohol will remove the oil.
For larger shows or installations, multiple consoles are sometimes used together and in some cases lighting controllers are combined or coordinated with controllers for sound, automated scenery, pyrotechnics and other effects to provide total automation of the entire show, using a specific branch of MIDI technology called MSC (MIDI show control). See show control.
The lighting controller is connected to the dimmers (or directly to automated luminaires) using a control cable or wireless link (e.g. DMX512) or network, allowing the dimmers which are bulky, hot and sometimes noisy, to be positioned away from the stage and audience and allowing automated luminaires to be positioned wherever necessary. In addition to DMX512, newer control connections include RDM (remote device management) which adds management and status feedback capabilities to devices which use it while maintaining compatibility with DMX512; and Architecture for Control Networks (ACN) which is a fully featured multiple controller networking protocol. These allow the possibility of feedback of position, state or fault conditions from units, whilst allowing much more detailed control of them.
In the case of incandescent lamps, some color changes occur as a lamp is dimmed, allowing for a limited amount of color control through a dimmer. Fades (brightness transitions) can be either UP or DOWN, meaning that the light output is increasing or decreasing during the transition. Most modern dimmers are solid state, though many mechanical dimmers are still in operation.
In many cases, a dimmer can be replaced by a constant power module (CPM), which is typically a 20- or 50-ampere breaker in a dimming module casing. CPMs are used to supply line voltage to non-dimming electrical devices such as smoke machines, chain winches, and scenic motors that require constant operating voltage. When a device is powered by a CPM, it is fully energized whenever the CPM is turned on, independent of lighting console levels. CPMs must be used (in lieu of dimmers) to power non-dimming devices that require specific line voltages (e.g. in the US, 120 V, 60 Hz power) in order to avoid damage to such devices. Dimmers are seldom used to control non-dimming devices because even if a dimmer channel is trusted to always operate at full power, it may not be controlled when communications are disrupted by start up and shut down of the lighting control surface, noise interference, or DMX disconnects or failure. Such a loss of control might cause a dimmer to dim a circuit and thus potentially damage its non-dimming device.
Devices like moving heads also require independent power, as they cannot function on a partially dimmed channel for power, on top of requiring several other channels in order to convey all of the data they require for their several features. In order to simplify the control of moving head lanterns, instead of assigning channels manually to the lantern, many desks also offer a fixtures section, where one can assign the lantern as a fixture, allowing the desk to organise the data being transferred to the lantern on a much simpler scale for the operator. Fixtures may also incorporate smoke machines, snow machines, haze machines etc., allowing many special effects to be run from a single desk.
Increasingly, modern lighting instruments are available which allow remote control of effects other than light intensity, including direction, color, beam shape, projected image, and beam angle. The ability to move an instrument ever more quickly and quietly is an industry goal. Some automated lights have built-in dimming and so are connected directly to the control cable or network and are independent of external dimmers.
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