Efficiency and efficacy

Efficiency and efficacy

The “efficacy” of a lighting fixture is usually expressed as the amount of light (in lumens) produced by a certain amount of electricity (in watts). Lighting fixture “efficiency” is the ratio of the total lumens exiting the fixture to the total lumens produced by the light source. Efficiency is also used to discuss the broader concept of using resources efficiently. What to remember: specified fixture that you are looking at the appropriate fixture data versus the LED source data.

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