The efficacy of a light fixture refers to the amount of light output per unit of energy consumed (usually measured in lumens per watt). Therefore, a higher efficacy means that the light fixture is producing more light per unit of energy used, resulting in a more energy-efficient fixture. Generally, a higher efficacy light fixture uses less energy to produce the same amount of light compared to a lower efficacy fixture. Therefore, when selecting a light fixture, it's important to consider not only the amount of light it emits but also its efficacy as it can significantly affect the amount of energy used by the fixture.
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