![]() ![]() That is, when the luminous angle of a light source is one solid angle and the luminous flux is 1 lumen, its luminous intensity is 1 candela. The lumen is defined in relation to the candela which is the unit of luminous intensity as The SI unit of luminous flux is the lumen (lm). It shouldn’t be considered perfectly accurate, but it is a good representation of visual sensitivity of the human eye and it is valuable as a baseline for experimental purposes.įigure 1: Photopic (black) and scotopic (green) luminosity functions The Unit of Luminous Flux-Lumen ![]() The luminosity function describes the relative sensitivity of human eyes to light of different wavelengths by subjectively judging the brightness of light of different colors. So that it is the weighted sum of all wavelengths of power in the visible light band, excluding infrared and ultraviolet. It reflects the sensitivity of the human eye by weighting each wavelength with a luminosity function. Luminous flux is the amount of light that the human eye senses. Radiation flux is the measurement of all electromagnetic radiation emitted (including infrared, ultraviolet and visible), which is the total amount of objective light. Luminous flux is a measure of the total amount of visible light emitted by a lamp. But what are the specific definitions of luminous flux and illumination? What’s the difference between them? What is Luminous Flux? Maybe you know these two parameters are used to describe the brightness of light. We often see luminous flux or illumination data on the packaging of light bulbs or other lamps. ![]()
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