Lighting Design and Simulation Knowledgebase
(Transmission factor is an old and deprecated term for transmittance.)
(Terms of radiometry/photometry)
Transmittance is the ratio of the total radiant or luminous flux transmitted by a transparent object to the incident flux, usually given for normal incidence.
Transmissivity
Atmospheric Transmissivity
Transmission coefficient
The ratio of the directly transmitted light after passing through
one unit of a participating medium (atmosphere, dust,
fog) to the amount of light that would have passed the
same distance through a vacuum. It is the amount of light
that remains after the absorption coefficient and
the scattering coefficient (together the
extinction coefficient) are accounted for.
In the Radiance software, those units are used in the specification of several material types:
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References: |
absorption coefficient extincton coefficient luminous flux Radiance software radiant flux reflectance scattering coefficient |
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| English | German | |
| transmittance | Der Transmissionsgrad | |
| transmissivity atmospheric transmissivity transmission coefficient |
Der Transmissionskoeffizient |
