darksky.org

Website:https://www.darksky.org
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Definitions (42)

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your email


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subject


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veiling luminance


A luminance produced by bright sources in the field-of-view superimposed on the image in the eye reducing contrast and hence visibility.
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wallpack


A luminaire, typically affixed to the side of a structure, used for area lighting.   X   Y   Z
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shielding


An opaque material that blocks the transmission of light.
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spotlight


A fixture designed to light only a small, well-defined area.
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refractor


An optic that achieves control of light by means of refraction (using lenses).   S
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quality of light


A subjective ratio of the pluses to the minuses of any lighting installation.   R
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metal-halide lamp


An HID lamp where the light is produced by radiation from metal-halide vapors.
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nanometer


10-9 meter. Often used as the unit for wavelength in the EM spectrum.
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