Lux
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The lux is the unit of illuminance, or luminous flux per unit area, in the International System of Units. It is equal to one lumen per square metre. In photometry, this is used as a measure of the irr
A lux meter for measuring illuminance
Lumen (unit)
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The lumen is the SI unit of luminous flux, which quantifies the perceived power of visible light emitted by a source. Luminous flux differs from power, which encompasses all electromagnetic waves emit
Lux
…The lux (symbol: lx) is the unit of illuminance, or luminous flux per unit area, in the International System of Units (SI). It is equal to one lumen per square metre. In photometry, this is used as a measure of the irradiance, as perceived by the spectrally unequally responding human eye, of light…
André Blondel, creator of the lumen
A 470-lumen LED lamp. It consumes about one sixth the electrical power of an incandescent light bulb producing the same light.