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‘Lumen’ is the unit of which of the following?
1. Luminous Intensity
2. Luminous Flux
3. Magnetic Flux
4. None of these

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Correct Answer - Option 2 : Luminous Flux

The Correct Answer is Luminous Flux.

  • Luminous Flux is energy per unit time that is radiated from a source over visible wavelengths.
  • More specifically, it is energy radiated over wavelengths sensitive to the human eye, from about 330 nm to 780 nm. 
  • Thus, luminous flux is a weighted average of the Radiant Flux in the visible spectrum. 

  • Luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye.
  • The SI unit of luminous intensity is the candela, an SI base unit.
  • In physics, specifically electromagnetism, the magnetic flux through a surface is the surface integral of the normal component of the magnetic field B over that surface.
  • The SI unit of magnetic flux is the weber and the CGS unit is the maxwell.

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