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TeachMeFinance.com - explain Lumen Lumen The term 'Lumen' as it applies to the area of energy can be defined as ' An empirical measure of the quantity of light. It is based upon the spectral sensitivity of the photosensors in the human eye under high (daytime) light levels. Photometrically it is the luminous flux emitted with a solid angle (1 steradian) by a point source having a uniform luminous intensity of 1 candela'. Previous 5 Terms: luciform lucimeter lucriferous lumbriciform lumbricine Next 5 Terms: lumen Lumens-Watt (lpw) luminiferous lump Lump-sum sales About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.