Tektronix LumaColor II J18, Instruction Manual

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Glossary
Glossary–2 J18 Photometer Instruction Manual
Luminance
The amount of light emitted or scattered by a surface. Usually
measured in candelas/meter
2
(nits)or foot-lamberts with a sensor
spectrally matched to the average human eye.
Luminous Flux
The total light from a source, measured in lumens with a sensor
spectrally matched to the average human eye.
Luminous Intensity
The luminous flux through a unit of solid angle. Usually
measured in candelas (lumens/steradian) with a sensor spectrally
matched to the average human eye.
Photometry
Measurement of light as seen by the human eye.
Photopic Correction
The correction of a sensor to match the CIE sensitivity function
of the average human eye.
Point Source
A light source of small angular size, such that light appears to
come from a point.
Radiance
The amount of radiant energy emitted or scattered by a surface.
Usually measured in watts/meter
2
/steradian with a sensor having
equal spectral sensitivity to all wavelengths being measured.
Radiant Flux
The total radiation from a source, measured in watts with a
sensor having equal spectral sensitivity to the wavelengths being
measured.
Radiant Intensity
The radiant flux through a unit of solid angle. Usually measured
in watts/steradian with a sensor having equal spectral sensitivity
to the wavelengths being measured.
Glossary
Glossary–2 J18 Photometer Instruction Manual
Luminance
The amount of light emitted or scattered by a surface. Usually
measured in candelas/meter
2
(nits)or foot-lamberts with a sensor
spectrally matched to the average human eye.
Luminous Flux
The total light from a source, measured in lumens with a sensor
spectrally matched to the average human eye.
Luminous Intensity
The luminous flux through a unit of solid angle. Usually
measured in candelas (lumens/steradian) with a sensor spectrally
matched to the average human eye.
Photometry
Measurement of light as seen by the human eye.
Photopic Correction
The correction of a sensor to match the CIE sensitivity function
of the average human eye.
Point Source
A light source of small angular size, such that light appears to
come from a point.
Radiance
The amount of radiant energy emitted or scattered by a surface.
Usually measured in watts/meter
2
/steradian with a sensor having
equal spectral sensitivity to all wavelengths being measured.
Radiant Flux
The total radiation from a source, measured in watts with a
sensor having equal spectral sensitivity to the wavelengths being
measured.
Radiant Intensity
The radiant flux through a unit of solid angle. Usually measured
in watts/steradian with a sensor having equal spectral sensitivity
to the wavelengths being measured.