Convert luminous flux between lumen and candela-steradian (1 lm = 1 cd·sr by definition).
Luminous flux measures the total amount of light emitted by a source, weighted by the sensitivity of the human eye. The lumen (lm) is the SI unit and, by definition, 1 lm = 1 cd·sr (candela times steradian). Because they are equivalent by definition, 1 lumen always corresponds to 1 candela-steradian. This tool shows that exact equivalence.