title: Wall-plug efficiency
text: # Wall-plug efficiency
  
  In optics, wall-plug efficiency or radiant efficiency is the energy conversion efficiency with which the system converts electrical power into optical power. It is defined as the ratio of the radiant flux (i.e., the total optical output power) to the input electrical power.
  
  In laser systems, this efficiency includes losses in the power supply and also the power required for a cooling system, not just the laser itself.
  
  