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Definition:

Illuminance is the total luminous flux incident on a surface, per unit area. It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception.

Explain:

Illuminance = Lumen/ Square Meter

ill 01

PlaceIlluminance (lux)
Under the blazing sun100,000
Cloudy day80,000
Drawing600
Reading500
Night baseball field400
Office / Classroom300

Application:

ill 02High Illuminance

ill 03Low Illuminance

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【Lighting Knowledge】Illuminance
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