Illuminance was formerly often called brightness, but this leads to confusion with other uses of the word, such as to mean luminance. This Illuminance converter allows you to convert candle-steradian/sq. meter (c·sr/m²), centimeter-candle (cm·c), foot-candle (ft·c, fc), lumen/sq. centimeter (lm/cm²), lumen/sq. foot (lm/ft²), lumen/sq. inch (lm/in²), lumen/sq. meter (lm/m²), lux (lx), meter-candle (m·c), milliphot (mph), nox, phot (ph), among other units related to Illuminance.