Luminous efficacy
MEASURE OF HOW WELL A LIGHT SOURCE PRODUCES VISIBLE LIGHT
Luminous coefficient; Luminous efficiency; Lighting efficiency; Luminous efficacies; Lighting efficacy; Lm/W; Overall luminous efficiency; Overall luminous efficacy; Wall-plug luminous efficacy; Wall-plug efficacy; Wall-plug luminous efficiency; Luminous efficacy of a source; Luminous efficacy of radiation; Lumen per watt; Lumens per watt; Bulb efficiency
Luminous efficacy is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power, measured in lumens per watt in the International System of Units (SI).