Green Terms

Glossary of Green Terms

 

 

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Efficacy is the amount of energy service or useful energy delivered per unit of energy input. Often used in reference to lighting systems, where the visible light output of a luminary is relative to power input; expressed in lumens per Watt; the higher the efficacy value, the higher the energy efficiency. Source: U.S. Department of Energy Office of Energy Efficiency and Renewable Energy

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