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Grip and Lighting Illustrated Online Dictionary for Film and Video Production
H - from Halogen to Hollywood Box
H
Halogen - is a gas from the non-metallic Halogen class of elements used in
tungsten-(filament) halogen light bulbs. Halogen gas is created by a mix
of any of the elements in that class including: astatine, bromine,
chlorine, fluorine and iodine, Video and film production
tungsten-halogen lights have a color temperature of 3200K in
general. Their color temperature can vary with age of the globe, manufacturer, and
other factors.
High key - describes a lighting stylee that is bright overall,
not moody, with faint and/or few shadows. Many television sitcoms,
especially older ones from the 1960'sand '70's are lit in a high key
style. It works fairly well for multi-camera set-ups, but is used in all
types of programs and films, as it has an "up" mood or feel.
See also: low key.
High-rollers (aka high boy and overhead stand) -
high-rollers are large, heavy-duty stands with locking caster wheels, usually two-riser
stands with a large grip head, and a junior receiver. A high-high roller
has three risers. They have many uses including: supporting and floating
large frames with silks/ reflective materials/ nets, and support for
larger lights such as 6K, 12K and even larger HMI's. High-boys (without
wheels) are easier to use on exterior locations, since they
won't roll with a wind.
HMI - stands for hydragyrum medium-arc iodide, and is a
sealed/enclosed type of bulb/ globe used extensively in film and video
production. Hydragyrum is the Latin word for mercury. A mix of mercury
and metal halides are sealed in a quartz tube or enclosure, with two
tungsten electrodes providing the ignition points for an arc to occur,
causing a very intense point of light. HMI light is generally 5600K color temperature, and so is "daylight balanced", or
close to it at most times of day. Obviously, this type of light is very
useful in situations where sunlight is the dominant source, indoors or
out. HMI's can provide a lot more illumination from a given wattage than
regular tungsten lights can. Example: a 1200w PAR HMI kicks out more
light than a tungsten 2K. HMI lights use a ballast device to boost,
condition and feed power to the igniter and maintain the resulting arc glow.
Hollywood box - a stage-plug type power breakout box used to
distribute electricity around a set or location. Most power distro
systems now use cam-lock type connectors rather than stage-plug type
cables and distribution devices.
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