the rate of flow of light energy or power of visible light emitted from a light source, measured in lumens
The rate that light flows
see visible radiation sichtbare Strahlung (Licht)
The intensity of a light source, measured in lumens.
is defined as the total electromagnetic energy emitted by the light source into a sphere (360°) surrounding the light source.
Visible light energy flow measurement past any given point in space and is defined as the flux amount generated by a source (one candela into a solid angle of one steradian).
The time rate of flow of light.
visible power, or light energy per unit time. Measured in lumen
The rate of flow of light, measured in lumens. The overall light output of a lamp.
is the rate of flow of light.
The flux of visible radiation, so weighted as to account for the manner in which the response of the human eye varies with the wavelength of radiation. The basic unit for luminous flux is the lumen.
The light emitted by a source or received by a surface
The amount of light flowing over a given area in a period of time. (See Lumens).
In photometry, luminous flux or luminous power is the measure of the perceived power of light. It differs from radiant flux, the measure of the total power of light emitted, in that luminous flux is adjusted to reflect the varying sensitivity of the human eye to different wavelengths of light.
