Lumen | domainSubclass | SystemeInternationalUnit | SI LuminousFluxMeasure. Symbol: lm. It is the amount streaming outward through one solid angle of 1 Steradian from a uniform point source having an intensity of one Candela. Lumen = cd*sr = cd * 1 | Physical | rangeSubclass | MeasureFn | ConstantQuantity, FunctionQuantity | (=> (and (instance ?REL RelationExtendedToQuantities) (instance ?REL BinaryRelation) (instance ?NUMBER1 RealNumber) (instance ?NUMBER2 RealNumber) (holds ?REL ?NUMBER1 ?NUMBER2)) (forall (?UNIT) (=> (instance ?UNIT UnitOfMeasure) (holds ?REL (MeasureFn ?NUMBER1 ?UNIT) (MeasureFn ?NUMBER2 ?UNIT)))))
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