Lux
Unit of illuminance
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 intensity, as perceived by the human eye, of light... Wikipedia
1 lx in: is equal to
CGS units: 10−4 ph
SI base units: cd⋅sr⋅m−2
Symbol: lx
Unit of: illuminance
Unit system: SI
US customary units: 0.0929 fc