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Light-ology 101
Have a lighting question? We can help! Please send your lighting inquiries and/or comments to: questions@jaftech.com
Q: What is the difference between efficiency and efficacy?
A: It's quite common for the two to get mixed up, or interpreted as the same meaning. Efficacy is a term normally used in cases where the input and output units differ. In lighting, we are concerned with the amount of light (in lumens) produced by a certain amount of electricity (in watts).
Properly measured, Luminaire Efficacy combines both the light source system efficacy and luminaire efficiency, allowing for a true comparison of a luminaire regardless of the light source. Luminaire efficacy is the preferred metric for LEDs because it measures the net light output from the luminaire divided by power into the system, accounting for driver, optical, and thermal losses. Methods for measuring luminaire efficacy of Solid-state lighting fixtures and lamps are defined in the IESNA standard, LM-79-2008.
Further Reading:
LED Measurement Series
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