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Illuminance
The illuminance or light level is the amount of light energy reaching a given point on a defined surface area, namely the luminous flux (i.e. lumens) per square meter.
Illuminance is invisible! It is light passing through space and not seen unless you look at the source (e.g. a light bulb) or a surface it reflects off. In other words we can only see "luminance" (see next section).
