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U
ULTRASONIC FREQUENCY
a frequency lying above the audio frequency range. The term is commonly
applied to elastic waves propagated in gases, liquids, or solids.
ULTRAVIOLET ENERGY
Any radiant energy within the wavelength range 100 to 400 nanometers is
considered ultraviolet radiation (1 nanometer = 1 billionth of a meter, or 1
X 10-9 m).
UL
Underwriters Laboratories. An organization that tests electrical components
and appliances and lists products that pass safety standards.
UV FILTER
A device for changing, by transmission or reflection, the magnitude or
spectral composition of the flux of UV incident upon it.
ULTRA VIOLET (UV)
An ultraviolet light source used to create special lighting effects with
fluorescent materials. UV sources can be incandescent, fluorescent, or
preferably HID lamps.
UNION HOUSE
A venue that is a union house, holds a collective bargaining agreement with
its union employees guaranteeing such things as pay scale, working hours and
conditions. If a theatrical venue is a union house it is most likely covered
by I.A.T.S.E.
USAA (United Scenic Artists of America)
A union representing mostly theatrical lighting designers, costume
designers, and scenic designers and painters.
USITT (United States Institute of Theater Technology)
An organization of individuals who work in the professional and academic
theater. One of USITT's most notable accomplishment is specifying the DMX
512 control protocol.
ULTRA-VIOLET (UV)
Short wavelength source of light at the end of the visible light
electromagnetic spectrum which causes specially treated materials to
fluoresce on an otherwise blackened stage. Used for special effect and for
lighting onstage technical areas (eg Fly Floors). Ultraviolet sources
designed for stage use are known as Black Light sources (also known as UV-B)
and have all harmful radiations filtered out.
Black Light is used extensively in the Czech Republic where stunning effects
are achieved on stages lined with black velvet.
UPLIGHT
Light from below the actors - from a light source on the stage floor.
UPSTAGE
1) The part of the stage furthest from the audience.
2) When an actor moves upstage of another and causes the victim to turn away
from the audience he is "upstaging". Also, an actor drawing attention to
himself away from the main action (by moving around, or over-reacting to
onstage events) is upstaging.
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