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D
DIAPHRAGM
The part of a microphone which responds to sound waves.
DICHROIC FILTER
Glass color filters which reflect all light except that which is the color
of the filter, which passes through. Normal plastic gels absorb the unwanted
colors, turning the light into heat. Dichroic filters run cooler, and
produce a much cooler beam of light. Longer lasting, but a lot more
expensive, they are predominantly used in moving lights or architectural
applications.
DICHROIC LAMP
A low voltage display lamp with a reflector that lets heat pass through it,
rather than reflecting it. Results in a much "cooler" light.
DIGITAL
Many electronic devices use digital logic. Information is handled in
separate bits (either ON or OFF) rather than continuously variable analog
signals. Most computer lighting boards give a digital multiplexed output,
and more and more sound equipment is going digital.
DIGITAL DIMMER
The new generation of dimmers that can respond directly to the digital
multiplexed output of the lighting desk. The technology also permits the
dimmer to report faults and other data back to the control board.
DIGITAL LIGHT CURTAIN / DLC / D.L.C.
A remotely controllable motorized batten fitted with an integral color
changer. The DLC can now be controlled via DMX (via an interface) although
it originally used software called Light Moves running on a Mac. The effect
produced by this lantern is a wall of light (when used with a HAZE MACHINE).
DIM OUT
Reduction of lighting level for a scene change, that isn't quite a BLACKOUT.
DIMMER
Electrical or electronic device which controls the amount of electricity
passed to a lantern, and therefore the intensity of the lamp.
DIMMER DOUBLING
A system designed by ETC where two ETC lanterns can be connected to a single
ETC dimmer, and have different intensities. It only works with 115V / 60Hz
supplies (e.g. USA). A special adapter ("twofer") is connected to the dimmer
output. This contains a series of diodes which split the AC sine wave into
two halves (positive and negative). Each half is sent to a separate socket
on the adaptor and from there to a modified ETC Source Four lantern with a
77 volt lamp. Using these lower voltage lamps means that full intensity is
achievable using only half the AC wave. The system will not work in the UK
or other countries with 50Hz power supplies as the flickering of the lamps
is too noticeable.
DIMMER LAW (Control desk)
The dimmer law in a lighting desk defines the relationship between the
control value (fader position) and the console output value (outgoing DMX
level).
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