Preferred Label : photometry;
IUPAC definition : The measurement of light over wavelengths which produce visual sensation (approximately
380-780 nm). Thus photometric quantities do not refer to a specific wavelength but
to the light emitted by a standard source (formerly a 'standard international candle',
now a blackbody radiator emitting at the temperature of solidifying platinum, 2042
K). luminance and illuminance are the photometric analogues of the radiometric quantities
radiance and irradiance, respectively, but conversion from photometric units (e.g.
lm cm-2) to radiometric units (e.g. J s-1 cm-2) requires convolution over wavelength
of the spectral radiation with the relative spectral response of the human eye. The
standard response is called the 'spectral luminous efficiency of radiation', and is
tabulated for daylight adapted vision in photopic response tables.;
Origin ID : P04625;
UMLS CUI : C0031752;
Automatic exact mappings (from CISMeF team)
- See also
- Semantic type(s)
- UMLS correspondences (same concept)
The measurement of light over wavelengths which produce visual sensation (approximately
380-780 nm). Thus photometric quantities do not refer to a specific wavelength but
to the light emitted by a standard source (formerly a 'standard international candle',
now a blackbody radiator emitting at the temperature of solidifying platinum, 2042
K). luminance and illuminance are the photometric analogues of the radiometric quantities
radiance and irradiance, respectively, but conversion from photometric units (e.g.
lm cm-2) to radiometric units (e.g. J s-1 cm-2) requires convolution over wavelength
of the spectral radiation with the relative spectral response of the human eye. The
standard response is called the 'spectral luminous efficiency of radiation', and is
tabulated for daylight adapted vision in photopic response tables.
