The lumen is a measure of "luminous flux;" a standard 100-watt lightbulb gives off 1500–1700 lumens. Luminous flux indicates how much light is actually perceived by the human eye.

Add to word list physics, earth science the standard unit for measuring the brightness of a light, equal to the amount of light hitting one square foot of surface one foot away from the light …

The lumen (symbol: lm) is the SI unit of luminous flux, which quantifies the perceived power of visible light emitted by a source. Luminous flux differs from power (radiant flux), which …

One lumen is equal to the luminous flux passing per unit solid angle from a light source with a strength of one candela. Examples are provided to illustrate real-world usage of words in …

Lumen, unit of luminous flux, or amount of light, defined as the amount streaming outward through one steradian (a unit of solid angle, part of the volume of space illuminated by a light source) …

a unit for measuring the rate of flow of light. Definition of lumen noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage …

The red dashed line represents the interface between the blood in the capillary lumen and the GBM.

The total amount of visible light a source (like a bulb or the sun) sends out in every direction. The more lumens, the brighter! When you see a light bulb rated for a certain number of lumens, it …

lumen /ˈluːmɪn/ n ( pl -mens, -mina / -mɪnə /) the derived SI unit of luminous flux; the flux emitted in a solid angle of 1 steradian by a point source having a uniform intensity of 1 candela

Lumen definition is: “a unit of luminous flux in the International System of Units (SI), that is equal to the amount of light given out through a solid angle by a source of one candela intensity …