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One lumen is defined as the luminous flux of light produced by a light source that emits one candela of luminous intensity over a solid angle of one steradian.
en.wikipedia.org The steradian is a measure of solid angle, and meters squared are used here as a measure of cross-sectional area, as shown at right.
en.wikipedia.org It covers a large fraction of the sky (over one steradian fully coded, three steradians partially coded; by comparison, the full sky solid angle is 4 or about 12.6 steradians).
en.wikipedia.org The radiation intensity is expressed in watts per unit solid angle (watts per steradian).
en.wikipedia.org