| Sr No. | Luminous Flux | Lumens |
| 1 | Luminous flux is the quantity of the energy of the light emitted per second in all directions. | Lumens are denoted by lm are a measure of the total amount of visible light to the human eye from a light source or lamp. |
| 2 | The lumen is the standard unit of luminous flux. | The lumen (symbol: lm) is the SI derived unit of luminous flux |
| 3 | Luminous flux is often used as an objective measure of the useful light emitted by a light source and is typically reported on the packaging for light bulbs, although it is not always prominent. | Lumens used in a house depends on a number of factors including; room size and shape, ceiling height, colour scheme or interior, type of lamps & fitting, task areas and needs of the user. |
| 4 | It is the quantity characteristic of radiant flux which expresses its capacity to produce visual sensation evaluated according to the values of relative luminous efficiency for the light-adapted eye: | In other words, it is an SI unit of luminous flux. The luminous flux emitted within unit solid angle (one steradian) by a point source having a uniform intensity of one candela. |
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