Luminous flux is a measure of the energy emitted by a light source in all directions. Prism splitting light Light is electromagnetic radiation with a wavelength that is visible to the eye, or in a more general sense, any electromagnetic radiation in the range from infrared to ultraviolet. ...
The SI unit of Luminous flux is the lumen (lm). SI (disambiguation). ... For alternate uses of the term lumen, see lumen In physics, specifically photometry (optics), the lumen (symbol: lm) is the SI derived unit of luminous flux. ...
One lumen is defined as the amount of light that falls on a unit area at unit distance from a light source of one candela.
The luminousflux is the part of the power which is perceived as light by the human eye, and the figure 683 lumens/watt is based upon the sensitivity of the eye at 555 nm, the peak efficiency of the photopic (daylight) vision curve.
For instance, the LuminousFlux for a 100W incandescent lamp is approximately 1700 lm.
Luminousflux is the quantity of the energy of the light emitted per second in all directions.
Luminous intensity is the ability to emit light into a given direction, or it is the luminousflux that is radiated by the light source in a given direction within the unit of the spatial angel.
Luminance L is the luminous intensity emitted by the surface area of 1 cm² (or 1 m²) of the light source.
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