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Daisy
Chain
- A control
signal wiring system employed in the interconnection of a plurality
of some electronic items, such that the first item’s output
connector is connected to a second item’s input connector
via a control cable. A third item is connected to the second
in the same manner, and so on until all items have been connected.
The control console is connected to the input connector of the
first item only, but sends data to all items via the interconnecting
control cables. Some items that can sometimes be daisy chained
are color scrollers, automated luminaires, and dimmer racks
or packs.
- See the
definition for Feed Through.
Daylight
Light that has a color temperature of approximately 5500-5600°K,
which has been approximated to be the color temperature of ordinary
sunlight during the day under normal atmospheric conditions.
Daylight Filter
A filter used to balance light from a source such that the spectral
distribution will approximate daylight, i.e. 5500-5600°K.
DC
Abbreviation for Direct Current.
DC Voltage
An abridged version of Direct Current Voltage.
Dichroic
A type of metallic coating applied to glass and some other materials
that allow certain wavelengths of light, or other electromagnetic
radiation, to pass while reflecting all others.
Diffuse
- To scatter
light using diffusion material.
- A term
used to describe a somewhat dull and/or stippled surface that
is moderately reflective.
Diffuse
Light
Soft, generally even illumination.
Diffuser
- Generally,
something made of diffusion material.
- In the
film and video industries, a fabric panel, used for diffusing,
with the light source being a luminaire or sunlight. They are
available in a variety of sizes and shapes, and materials of
varying textures.
Diffusion
An abridged version of Diffusion Material or Diffusion
Media.
Diffusion Frame
An apparatus used to hold diffusion material. It can be of various
shapes and sizes, and may comprise one or more pieces.
Diffusion Material
Any reflecting or transmitting media for which the reflected or
transmitted light is distributed uniformly, i.e. scattered over
a wide range.
Diffusion Media
See the definition for Diffusion Material.
Digital
A term used to describe the use of binary code to record information
reduced to numerical form, usually instructional information when
referring to control consoles.
Digital Multiplex (DMX)
A system that simultaneously transmits more than one digital signal.
Dim
To change the intensity of a luminaire.
Dimmer
An apparatus used to control the intensity of a luminaire.
Dimmer Pack
A
portable housing that contains a group of electronic dimmers, usually
not less than 4 or more than 24. Some dimmer packs are designed
such that they can be permanently installed.
Dimmer Panel
An apparatus, usually 19" long, that contains a group of electronic
dimmers that get installed into a dimmer rack.
Diode
A solid state rectifier.
Direct Current (DC)
An electrical current that maintains constant direction.
Direct Current Voltage
A voltage that maintains constant polarity.
Direct Lighting
Illumination on a subject or area that goes directly from the front
of the luminaire in a straight line to the subject or area.
Distribution
An abridged version of Light Distribution.
DMX
Abbreviation for Digital Multiplex.
DMX 512
A somewhat unique digital multiplex signal with specific characteristics
that is commonly used in the stage and studio lighting industries.
Control consoles designed to generate this signal were originally
designed to control a maximum of 512 apparatuses, usually dimmers,
but now can control many more.
Donut
A flat metal apparatus with a circular hole in the center used to
reduce halation and sharpen the image when using patterns.
Dot
A small, round scrim, diffuser, reflector, or gobo, placed close
to a luminaire, used for dimming, softening, bounce lighting, and
casting shadows, respectively. They are usually 3" to 10"
in diameter.
Double Ended Lamp
A somewhat elongated lamp that has a base and contact on each end.
Duvetyn (Duvatyne, Duvetine, Duvetyne, Duvyteen)
An opaque material used for butterflies, cutters, flags, gobos and
overheads in the film and video industries.
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