The percentage of light emitted from the light source that makes it out of the luminaire.
Power consumed by the light source, that’s what.
The light output from a light source is measured in lumens.
The way the lightsource represents colours and finishes i.e 95 CRI (A razzle dazzle new colour rating system TM-30-15 is also now in the works).
Just as a car’s efficiency is measured in kilometres per litre or tank, light efficacy is measured in lumens per watt.
The light measured at a specific point is known as lux.
The angle in which the light is distributed from a fitting (affects lux on surface).
The colour that’s visable from the light source i.e warm white, cool white.
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