Coefficient of Utilization 1 (CU) : The percentage of light generated within a luninaire which ultimately strikes the work surface. It is usually expressed as a decimal percentage
Young & Company Electric Power Products and Related Engineering Services, Glossary of Electrical Terms, http://www.youngco.com/young2.asp?ID=4&Type=3, CA., USA 2001. (Electr Sfty - Amer) {514}