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D
DIODE
A device with two electrodes, in particular an anode and a cathode, and a
non-linear current/voltage characteristic.
DIRECT GLARE
excessive brightness from a source of light in the line of sight. Luminairs
with poor optical control can be sources of direct glare.
DISABILITY GLARE
Excessive brightness from a source of light in the line of sight. Luminairs
with poor optical control can be sources of direct glare.
DISCOMFORT GLARE
glare that produces discomfort. It does not necessarily interfere with
visual performance or visibility.
DMX CONTROLLER
Digital multiplex (DMX), an industry standard control protocol for the
transmission of dimmer intensity or other data using a digital multiplex
method.
DOWNLIGHT
A directional luminair that directs light downward.
DICHROIC COLOR FILTER
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.
DIMMER
A device which causes connected lamps to decrease in intensity. Most dimmers
for entertainment lighting use are some variation of an SCR. Individual
dimmers are traditionally arranged in modules of two dimmers with modules
combined into dimmer racks.
DIMMER PACK
A portable enclosure containing between 3 and 12 dimmer modules.
DIMMER PER CIRCUIT
A dimming and circuiting system in which every circuit in the system has its
own permanently wired dimmer.
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