Choose Fixture Type Recessed Surface Suspended Wall

Choose Fixture Shape Round Square Rectangle Cylinder Linear

Choose Lamp Source Compact Fluorescent HID Incandescent LED

Choose Distribution Adjustable Downlight Wall Wash Direct/Indirect

Choose Aperture Size 4” 6” 7” 8” 10” 11” 12” 13” 14” 23” 4”x8” 6”x12” 8”x4” 12”x6” 4-ft 8-ft

What's the difference between efficiency and efficacy?

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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