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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 coefficient of utilization A term applied to lighting appliances and used to evaluate the effectiveness of luminaries in delivering light. It is the ratio of lumens received on a flat surface to the light output, in lumens, from a lamp. Related category    • LIGHTING TOPICS Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP