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The practical use of a ghost light is for safety. A ghost light enables one to navigate the theatre to find the lighting control console and to avoid accidents such as falling into the orchestra pit and stepping on or tripping over set pieces. There is an unsubstantiated story of a burglar who tripped on a dark stage, broke his leg and sued the ...
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.
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LED stage lighting is a stage lighting technology that uses light-emitting diodes (LEDs) as a light source. LED instruments are an alternative to traditional stage lights which use halogen lamp or high-intensity discharge lamps. Like other LED instruments, they have high light output with lower power consumption.
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Ultra-high-performance lamp. An ultra-high-performance lamp, often known by the Philips trademark UHP, is a high-pressure mercury arc lamp. [1] These were originally known as ultra-high-pressure lamps, [2] [3] because the internal pressure can rise to as much as 200 atmospheres when the lamp reaches its operating temperature.