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CGS. 1.076×10−3 phots. A foot-candle (sometimes foot candle; abbreviated fc, lm/ft2, or sometimes ft-c) is a non- SI unit of illuminance or light intensity. The foot-candle is defined as one lumen per square foot. This unit is commonly used in lighting layouts in parts of the world where United States customary units are used, mainly the ...
One lux is one lumen per square metre; similarly, one foot-candle is one lumen per square foot. The lumen is defined in relation to the candela as 1 lm = 1 cd·sr. A full sphere has a solid angle of 4π steradians, [3] so a light source that uniformly radiates one candela in all directions has a total luminous flux of 1 cd × 4π sr = 4π cd⋅ ...
One foot candle is about 10.764 lx. Since one foot-candle is the illuminance cast on a surface by a one-candela source one foot away, a lux could be thought of as a "metre-candle", although this term is discouraged because it does not conform to SI standards for unit names. One phot (ph) equals 10 kilolux (10 klx). One nox (nx) equals 1 ...
A foot-lambertor footlambert(fL, sometimes fl or ft-L) is a unit of luminancein United States customary unitsand some other unit systems. A foot-lambert equals 1/π or 0.3183 candelaper square foot, or 3.426 candela per square meter(the corresponding SI unit). The foot-lambert is named after Johann Heinrich Lambert(1728–1777), a Swiss-German ...
Illuminance. In photometry, illuminance is the total luminous flux incident on a surface, per unit area. [1] It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception. [2] Similarly, luminous emittance is the luminous flux per unit area ...
1 candela (modern definition) Candlepower (abbreviated as cp or CP) is a unit of measurement for luminous intensity. It expresses levels of light intensity relative to the light emitted by a candle of specific size and constituents. The historical candlepower is equal to 0.981 candelas. In modern usage, candlepower is sometimes used as a ...
Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. [1] It describes the amount of light that passes through, is emitted from, or is reflected from a particular area, and falls within a given solid angle. The procedure for conversion from spectral radiance to luminance is ...
0 lux. Absolute darkness. 10 −4. 100 microlux. 100 microlux. Starlight overcast moonless night sky [1] 140 microlux. Venus at brightest [1] 200 microlux.
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