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Whats the difference between efficacy and efficiency in lighting?

April 26, 2017efficiency lighting

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Whats the difference between efficacy and efficiency in lighting?

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Efficacy in lighting is primarily concerned with the amount of light (in lumens) produced by a certain amount of electricity (in watts). Lighting efficiency, on the other hand, is the ratio of total lumens exiting the fixture as opposed to the total lumens initially generated by the light source.