lumen Definition
the unit of luminous flux, equal to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela.
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Summary: lumen in Brief
The term 'lumen' [loo-muh n] refers to a unit of measurement for luminous flux. It is equivalent to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela.
