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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site lumen 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 (one steradian) by a point source having a uniform luminous intensity of one candela. Related categories    • SOLAR ENERGY AND POWER    • UNITS Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP