Join Date: Oct 2007
Location: Marion, OH
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Luminous efficacy is a property of light sources, which indicates what portion of the emitted electromagnetic radiation is usable for human vision. It is the ratio of emitted luminous flux to radiant flux. Luminous efficacy is related to the overall efficiency of a light source for illumination, but the overall lighting efficiency also depends on how much of the input energy is converted into electromagnetic waves (whether visible or not).I stole this from Wikipedia and was uncertain what 'efficacy' meant. The units I am used to are Volts/meter and Watts/(square Meter) for measuring electromagnetic waves. I am not used to thinking about Lumens, luminous flux, etc.