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H
HAZE MACHINE
Produces a fine mist for enhancing lighting effects
HALIDES
The metal-halogen compounds, known as halides, remain stable at high
temperatures, and do not cause deterioration of the quartz arc tube, which
they would do if left in their elemental forms.
HALOGEN LAMP
An incandescent lamp that employs a halogen-gas additive to improve lamp
life and efficacy.
HARMONICS
A sinusoidal component of a periodic wave or quantity having a frequency
that is an integral multiple of the fundamental frequency. For example, a
component of the frequency, which is twice the fundamental frequency, is
called the second harmonic.
HIGH PRESSURE SODIUM LAMP
An HID lamp in which radiation from sodium vapor under high pressure
produces visible light, characterized by a golden-yellow color.
HANGING POINT
The point where rigging is attached to a truss or piece of scenery. Location
of hanging points must be determined for structural safety, but must be
reconciled with available pickup points in the building or structure to
which the truss is being rigged.
HAZE MACHINE (HAZER)
A device, similar to a fog machine, which produces a light, fine atmosphere
by atomizing a special haze fluid. Since a haze machine does not utilize a
heat exchange system, like a fogger, there is no warm up time. The
atmosphere produced by a haze machine is dense enough to reveal beams of
light in the air, but not so dense as to become opaque.
HID (HIGH INTENSITY DISCHARGE)
High intensity discharge lamp: an electric lamp that produces light directly
from an arc discharge under high pressure. Metal halide, high pressure
sodium, and mercury vapor are types of HID lamps. A type of lamp such as a
mercury or sodium vapor lamp that produces light by causing an inert gas to
discharge photons. HID lamps find special uses in entertainment lighting and
make good UV sources. HID lamps require special ballasts and are generally
not dimmable.
HMI (HALIDE METAL INERT GAS)
A double ended short arc lamp which creates light by causing an electrical
current to jump between two electrodes within an inert gas atmosphere. HMI
lamps produce many lumens per watt making them many times more efficient
than incandescent sources. HMI lamps typically burn at around 5600 Kelvin.
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