# Wall-plug efficiency

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{{Short description|Energy conversion in optics}}

In [optics](/source/optics), '''wall-plug efficiency ''' or '''radiant efficiency''' is the [energy conversion efficiency](/source/energy_conversion_efficiency) with which the system converts [electrical power](/source/electrical_power) into [radiant flux](/source/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.<ref>N. P. Barnes, [https://ieeexplore.ieee.org/document/4244407 "Solid-state lasers from an efficiency perspective"], IEEE J. Sel. Top. Quantum Electron. 13 (3), 435 (2007)</ref>

For [laser](/source/laser)s, the power consumed includes losses in the [power supply](/source/power_supply) and the power used by the cooling system, not just the electrical power delivered to the laser itself.<ref>[https://ieeexplore.ieee.org/document/4453165 Experimental measurement of the wall-plug efficiency in THz quantum cascade lasers]</ref>

==See also==
* [Coefficient of utilization](/source/Coefficient_of_utilization)
* [Energy conversion efficiency](/source/Energy_conversion_efficiency)
* [Luminous coefficient](/source/Luminous_coefficient)
* [Luminous efficacy](/source/Luminous_efficacy) - Efficacy, weighted by the eye's response to light

==References==
{{Reflist}}

{{SI radiometry units}}

Category:Energy conversion

{{Optics-stub}}

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Adapted from the Wikipedia article [Wall-plug efficiency](https://en.wikipedia.org/wiki/Wall-plug_efficiency) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Wall-plug_efficiency?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.