What's the difference between efficiency and efficacy?
- Date added:
- Thursday, 07 July 2011
- Last revised:
- Monday, 11 July 2011
Answer
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). On the other hand,
efficiency is a term that is typically dimensionless. For example, lighting fixture efficiency is the ratio of the total lumens
exiting the fixture to the total lumens initially produced by the light source.
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