In optics, wall-plug efficiency or radiant efficiency is the energy conversion efficiency with which the system converts electrical power into radiant flux (radiant power). It is defined as the ratio of the radiant flux (i.e., the total optical output power) to the input electrical power. For lasers, the power consumed includes losses in the power supply and the power used by the cooling system, not just the electrical power delivered to the laser itself.
See also Coefficient of utilization Energy conversion efficiency Luminous coefficient Luminous efficacy - Efficacy, weighted by the eye's response to light
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