Since luminous flux considers the human eye’s sensitivity, it provides a practical measure of how bright a light source will appear to humans. This makes it a critical parameter in designing lighting for environments such as homes, offices, and public spaces.
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Applications
1 lm = 1 cd x 1 sr Luminous flux is related to power through the concept of luminous efficacy, which measures how well a light source converts electrical power (in watts) into visible light (in lumens). The maximum theoretical luminous efficacy is approximately 683 lm/W for monochromatic light at a wavelength of 555 nanometers, where the human eye is most sensitive.
