Illuminance refers to the degree to which an object is illuminated, expressed in terms of the luminous flux received per unit area, expressed in lux (lx), which is 1m/m2. A luminous flux of 1 lux equal to 1 lumen is uniformly distributed over an area of 1m2 of illumination. Illuminance is based on the luminous flux received by the vertical plane, and if tilted, the illuminance decreases Luminous flux is also an artificial quantity, which may be different from other animals, let alone completely natural things, because this definition is entirely based on the response of the human eye to light. Luminous flux is the amount of light energy that arrives, leaves, or passes through a surface per unit of time. Luminous flux can be measured using an integrating sphere, and illuminance can be measured using an illuminometer In chromaticity (including photometry), luminous flux is the basic definition, expressed in lumens (Lm). 1 lumen: frequency 540 × The luminous flux of monochromatic radiation at 1012 Hz with a radiation flux of 1/683 watts, symbol Φ V. That is, 1 watt radiation with a wavelength of 555nm in the air has a luminous flux of 683 lumens The unit of measurement is the lux (legal symbol lx) unit of illumination, which is the illumination intensity received at a distance of 1 meter from a light source with a light intensity of 1 cd. It is commonly known as candlelight per meter. That is, the illuminance at a distance of 1 meter from the light source, with an area of 1 square meter receiving 1 lm of luminous flux
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