Lumen (unit)

The lumen (symbol: lm) is the SI derived unit for brightness. It is defined as 1 candela times 1 steradian.

One lumen is about a twelfth the brightness of a candle, so a candle has a brightness of around 12 lumens.

v t e SI units
Authority: International System of Units (BIPM)
Base units	ampere candela kelvin kilogram metre mole second
Units based on other units	becquerel coulomb degree Celsius farad gray henry hertz joule katal lumen lux newton ohm pascal radian siemens sievert steradian tesla volt watt weber
Other SI units	astronomical unit bar dalton day decibel degree of arc electronvolt hectare hour litre minute minute of arc neper second of arc tonne atomic units natural units
See also	Conversion of units Metric prefixes Systems of measurement
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