visual photometer

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visual photometer [′vizh·ə·wəl fə′täm·əd·ər]

(optics)

A photometer in which the luminance of two surfaces is compared by human vision; it usually utilizes the Lummer-Brodhun sightbox or some adaptation of its principles.

photometer

Any instrument that measures photometric quantities such as luminance, luminous intensity, luminous flux, and illumination.

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