photometry (redirected from photometrist)

photometry /pho·tom·e·try/ (fo-tom´ĕ-tre) measurement of the intensity of light.

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photometry,

n the measurement of the intensity of light, usually in foot-candles.

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photometry

measurement of the intensity of light.

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photometry 

The measurement of light with a photometer. See candela per square metre; luminous flux; footcandle; footlambert; illuminance; luminous intensity; lambert; luminance; millilambert; photometer.

Table P3 Common photometric units

luminous flux

lumens

luminous intensity (I)

candela = lumens/steradian

illuminance (E)

lux = lumens/m²

footcandle = lumens/ft²

luminance (L)

candela/m²

candela/ft²

footlambert

lambert

millilambert

1 footlambert (fL) = 3.426 cd/m²

1 lambert = 3183 cd/m²

1 millilambert = 3.183 cd/m²

1 candela/m² = 0.2919 fL

1 candela/ft² = 3.142 fL