the lumen (symbol: lm) is the si derived unit of luminous flux, a measure of the total "amount" of visible light emitted by a source. luminous flux differs from power (radiant flux) in that luminous flux measurements reflect the varying sensitivity of the human eye to different wavelengths of light, while radiant flux measurements indicate the total power of all electromagnetic waves emitted, independent of the eye's ability to perceive it. lumens are related to lux in that one lux is one lumen per square meter. the lumen is defined in relation to the candela as : 1 lm = 1 cdÂ·sr. a full sphere has a solid angle of 4Â·Ï steradians, so a light source that uniformly radiates one candela in all directions has a total luminous flux of 1&nbsp;cdÂ·4Ï&nbsp;sr&nbsp;=&nbsp;4Ï&nbsp;cdÂ·sr&nbsp;â&nbsp;12.57&nbsp;lumens. ==explanation== if a light source emits one candela of luminous intensity uniformly across a solid angle of one steradian, the total luminous flux emitted into that angle is one lumen (1 cdÂ·1 sr = 1&nbsp;lm). alternatively, an isotropic one-candela light-source emits a total luminous flux of exactly 4Ï lumens. if the source were partially covered by an ideal absorbing hemisphere, that system would radiate half as much luminous flux&mdash;only 2Ï lumens. the luminous intensity would still be one candela in those directions that are not obscured. the lumen can be thought of casually as a measure of the total "amount" of visible light in some defined beam or angle, or emitted from some source. the number of candelas or lumens from a source also depends on its spectrum, via the nominal response of the human eye as represented in the luminosity function. the difference between the units lumen and lux is that the lux takes into account the area over which the luminous flux is spread. a flux of 1000 lumens, concentrated into an area of one square metre, lights up that square metre with an illuminance of 1000 lux. the same 1000 lumens, spread out over ten square metres, produces a dimmer illuminance of only 100 lux. mathematically, . a source radiating a power of one watt of light in the color for which the eye is most efficient (a wavelength of 555&nbsp;nm, in the green region of the optical spectrum) has luminous flux of 683 lumens. so a lumen represents at least 1/683 watts of visible light power, depending on the spectra
Photometry SI_derived_units Units_of_luminous_flux