Photometric Unit

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Photometric Unit

a unit of measurement of a photometric quantity. Examples of photometric quantities are luminous intensity, illuminance, luminance, and luminous flux. The unit of luminous intensity is the candela (cd), formerly known as the candle. It can be reproduced from photometric standards and is a base unit in the International System of Units.

Besides the units in the International System, other units of illuminance and luminance are also used; for example, 1 phot = 10⁴ lux, 1 footcandle (or 1 lumen per square foot) = 10.764 lux, 1 stilb = 10⁴ cd/m²,1 lambert = (1/π) x 10⁴ cd/m², and 1 footlambert X 3.426 cd/m².

D. N. LAZAREV

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No references found			This definition also decoupled the photometric units from the radiation properties of a source and allowed the photometric units to be determined by the measurement of optical power with appropriate photodetectors. The candela and photometric and radiometric measurements by Parr, Albert C. / Journal of Research of the National Institute of Standards and Technology			Photojournalism photojunction battery Photolithography photology Photoluminescence Photolysis Photomacrography photomagnetic effect photomagnetoelectric effect Photomap photomask photomechanical photomechanochemistry Photometer Photometer Bench Photometer Wedge Photometer, Integrating-Sphere Photometric Analysis Photometric Binary Photometric Density Equivalent Photometric Measurements photometric parallax Photometric Quantities Photometric Standard photometric titration Photometric Unit Photometry Photometry, Photographic Photometry, Pulse photomicrograph Photomicrography Photomontage photomorphogenesis photomosaic Photomosaic, Controlled Photomosaic, Uncontrolled photomultiplier photomultiplier cell photomultiplier counter photomultiplier tube Photon photon antibunching photon bunching photon coupled isolator photon coupling photon curve photon emission spectrum photon flux photon gas photon microscope photon sail			photomechanically photomechanics photomechanochemistry photometer photometer photometer Photometer Bench Photometer Wedge Photometer, Integrating-Sphere photometers photometers photometers Photometers for Imaging the Aurora photometric photometric photometric Photometric Analysis Photometric Analysis For Computer Vision Photometric Atlas of Northern Bright Galaxies photometric binary photometric brightness Photometric Density Equivalent Photometric Imaging Telescope Photometric Measurements Photometric parallax Photometric parallax method Photometric Particle Agglutination Method Photometric Quantities Photometric Standard photometric titration Photometric Unit photometrical photometrical photometrical photometrically photometrically photometrically photometrician photometrist photometrist photometrist photometry photometry photometry photometry Photometry and Radiometry Consultative Committee Photometry, Photographic Photometry, Pulse Photomezzotype photomicrograph photomicrograph photomicrograph photomicrographed photomicrographed photomicrographed photomicrographer photomicrographer photomicrographer photomicrographers photomicrographers photomicrographers

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