LUMEN

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is the opening area of the inside of a cylinder, or the unit of luminous flux.

LUMEN: "The inner-part or hollow area within a cylindrical shape is otherwise known as the lumen."
Cite this page: N., Sam M.S., "LUMEN," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/lumen/ (accessed June 25, 2022).

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