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Hair
Light
Light source aimed at the subject’s hair to create separation
from the background and add sparkle and highlights.
Halation
The distortion that appears around the edge of a sharply focused
beam pattern. This effect can be reduced with the aid of a donut.
Half Scrim
A metal scrim whose screen occupies one half of its frame such that
the straight edge of the screen is located at the diameter of the
frame.
Halogen
The name for a family of gases used in lamps to maintain proper
color temperature and to keep the inside wall of the envelope clean.
Hard Edge
A beam pattern edge that is very clear and distinguishable, i.e.
one without a fuzzy or blurry perimeter.
Hard Light
- Illumination
that has a hard edge and produces sharply defined shadows. Often
this light is very intense. The quality is more dramatic and
controllable, but generally less flattering than Soft Light;
often improved with Diffusion.
- A luminaire
that provides such illumination.
Head
- A general
term for a fresnel spotlight.
- The part
of a follow spot that contains the light source, i.e. not the
stand, ballast or interconnect cable.
- The part
of a metal halide luminaire that contains the lamp, i.e. not
the ballast or interconnect cable.
- The part
of an ellipsoidal spotlight that contains the reflector, i.e.
not the lens barrel or the cap.
- An abridged
version of Grip Head or Ball Head.
Hertz
A unit of measurement for the Frequency of alternating current,
i.e. one cycle per second.
Highboy (Hiboy)
A heavy-duty stand designed to hold luminaires or heavy grip equipment.
The stand is equipped with wheels and tall risers, and usually a
1 1/8" receiver and a grip head.
High Key
A lighting style in which the majority of the scene is highly illuminated,
usually enhanced by bright costumes and sets. A low ratio of key
plus fill light to fill light lowers the contrast, helping to obtain
this effect.
Hollywood Box
A piece of power distribution equipment used in the film and video
industries, comprising a metal housing, a means for connecting an
electrical supply, and female flush mount connectors and/or bus
bars that can be electrically connected to with bus bar lugs, for
the purpose of supplying electricity to luminaires. Some are also
provided with overcurrent protection.
Hot Lights
Common term for continuous light sources.
Hot Restrike
A term applied to an ignitor that will hot start an arc lamp.
Hot Spot
The spot of light with the highest intensity, ideally located at
or near the center of a beam that has been focused for a peak field.
Hot Start
A term used to describe the ignition of a heated arc lamp, i.e.
a lamp that has just been electrified.
HMI
Abbreviation for Hydrargyrum (Greek for Mercury) Medium-Arc Lodides.
This is a commonly used type of metal halide lamp manufactured by
Osram-Sylvania Corp. The term Osram HMI is trademarked.
HZ
Abbreviation for Hertz.
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