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Luminous flux refers to the radiant power that the human eye can perceive. It is equal to the product of the radiant energy in a certain wavelength band and the relative luminous efficiency of that band within a unit of time. Because the human eye (sensor) has different relative luminous efficiencies for different wavelengths of light, the luminous flux is not equal when the radiant powers of different wavelengths of light are equal.
The unit of luminous flux is the lumen (lm), where 1 lumen equals the luminous flux emitted within a solid angle of 1 steradian (sr) by a point light source with a uniform luminous intensity of 1 candela (cd), i.e., 1 lm = 1 cd-sr. In comparison to units in mechanics, luminous flux is akin to pressure, while luminous intensity is akin to pressure intensity. To make a point appear brighter when illuminated, we not only need to increase the luminous flux but also focus the light, essentially reducing the area, which results in greater intensity.
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