Definitions for "Luminous efficacy"
Keywords:  lumen, efficacy, watt, emitted, lpw
Total lumens emitted by a lamp divided by total input power.
The lumen output of a lamp per Watt of power it consumes.
The luminous efficacy is a light engineering term for the measure of the rate at which a lamp is able to convert electrical power (watt) to light (lumen). The luminous efficacy is therefore expressed in lumens per watt (LPW).