LUMINOUS EFFICCACY, UNIT: LM/W

Energy efficiency of light sources is typically mesasured in lumens per watt (lm/w).

It is indeed the luminous flux that is being emitted from a light source to the electric power by the source.

The luminous efficacies that can actually be attained vary depending on the lamp. Luminous efficiency of light source will be consumed by the representative of the efficiency of electrical energy into light.