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J17 Instruction Manual
G-1
Glossary
Area Source
A light source of large angular size.
Blackbody (Planckian Radiator)
A thermal light source having light produced by
heating. The intensity and color of a blackbody are
primarily dependent on operating temperature.
Chromaticity
The quality of color. Based on wavelength distribuĆ
tion and purity.
Color Temperature
The absolute temperature, in Kelvin, of a blackbody
required to produce an equivalent chromaticity
from a light source.
Correlated Color Temperature
The absolute temperature of a blackbody required
to most closely match the chromaticity of a light
source.
Illuminance
The amount of luminous flux received by a unit of
surface area. Usually measured in lux (lumens/meĆ
ter
2
) or footcandles with a sensor spectrally
matched to the average human eye.
Inverse Square Law
The falloff of light with distance; light varies inverseĆ
ly with the square of the distance from the source.
Irradiance
The amount of radiant flux received by a unit of
surface area. Usually measured in watts/meter
2
or
watts/cm
2
with a sensor having equal spectral
sensitivity to the wavelengths being measured.
J17 Instruction Manual
G-1
Glossary
Area Source
A light source of large angular size.
Blackbody (Planckian Radiator)
A thermal light source having light produced by
heating. The intensity and color of a blackbody are
primarily dependent on operating temperature.
Chromaticity
The quality of color. Based on wavelength distribuĆ
tion and purity.
Color Temperature
The absolute temperature, in Kelvin, of a blackbody
required to produce an equivalent chromaticity
from a light source.
Correlated Color Temperature
The absolute temperature of a blackbody required
to most closely match the chromaticity of a light
source.
Illuminance
The amount of luminous flux received by a unit of
surface area. Usually measured in lux (lumens/meĆ
ter
2
) or footcandles with a sensor spectrally
matched to the average human eye.
Inverse Square Law
The falloff of light with distance; light varies inverseĆ
ly with the square of the distance from the source.
Irradiance
The amount of radiant flux received by a unit of
surface area. Usually measured in watts/meter
2
or
watts/cm
2
with a sensor having equal spectral
sensitivity to the wavelengths being measured.