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D
DICHROIC COLOR FILTER
- Treated glass color filter that produces rich, vibrant colors.
- Color filters manufactured by vacuum depositing thin films onto heat resistant glass. Dichroic filters reflect rather than absorb unwanted wavelengths and so remain cooler and less subject to burn out. The process for creating dichroic filters is very precise and much more saturate (purer) colors can be created. As a result these filters are quite expensive and are used primarily in automated fixtures.
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.
DIFFUSER
A device to redirect or scatter the light from a source, primarily by the process of diffuse transmission.
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.
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