Photometry

n. measurement of the intensity of light (Physics); measurement of the brightness of stars (Astronomy)

Photometry can refer to:Photometry (optics), the science of measurement of visible light in terms of its perceived brightness to human vision Photometry (astronomy), the measurement of the flux or intensity of an astronomical object's electromagnetic radiation
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Photometry /pho·tom·e·try/ measurement of the intensity of light. photometry, n the measurement of the intensity of light, usually in foot-candles. [more]Photometry - Community and Resources

Noun
1. measurement of the proterties of light (especially luminous intensity)
(hypernym) measurement, measuring, measure, mensuration
(hyponym) cytophotometry

(n.)
That branch of science which treats of the measurement of the intensity of light.