[] An alternative, but deprecated, term for illuminance. It is sometimes used because illuminance is subject to confusion with luminance and illuminants, especially when not clearly pronounced.

Note: The term illumination also is commonly used in a qualitative or general sense to designate the act of illuminating or the state of being illuminated. Usually, the context will indicate which meaning is intended, but occasionally it is desirable to use the expression level of illumination to indicate that the quantitative meaning is intended.

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