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candle per square foot (cd/ft²)
candela per square meter (cd/m²)
millilux (mlx)
microlux (µlx)
lux (lx)
kilolux (klx)
lumen per square centimeter (lm/cm²)
lumen per square meter (lm/m²)
lambert (l)
stilb (sb)
nox
phot (ph)
In photometry, 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.