The unit of luminous flux is the lumen (symbol: lm). Luminous flux measures the total amount of visible light emitted by a source per unit of time, taking into account the sensitivity of the human eye to different wavelengths of light. It is an important quantity in fields such as lighting design and photometry to evaluate how much light a source emits in relation to human perception.
A lumen is a unit of measurement used to quantify the amount of visible light emitted by a source. It is part of the International System of Units (SI) and is used to express luminous flux, which is the total amount of light output from a light source as perceived by the human eye.
The rayleigh (symbol: R or ray) is a unit of measurement used in optics and physics to quantify the intensity of light, specifically for the measurement of the brightness of astronomical objects or the scattering of light. 1 rayleigh is defined as the amount of light scattered by a molecule of gas that results in a change of intensity of 1 photon per square meter per second.
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