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Til visse formål accepterer man en meget lille virkningsgrad. Det kan f.eks. dreje sig om en [[gaslaser]], der typisk omdanner mindre end en promille af den totale energi til nyttig energi i form af lys. Til gengæld har laserlyset nogle meget værdifulde egenskaber. [[Halvlederlaser]]e har typisk væsentlig større virkningsgrad.
 
[[Lysdiode]]r er idag (2006) lige så effektive som lysstofrør. <ref>[http://www.cree.com/press/press_detail.asp?i=1160427137863 October 9, 2006, Cree Delivers the First 160-Lumen White Power LED] Citat: "...XLamp LEDs now as efficient as fluorescent sources...The new XLamp LED was designed to enable general lighting applications, such as street lighting, retail high bay lighting and parking garage low bay lighting, as well as to vastly improve the light quality in consumer applications such as flashlights..."</ref>
[[Lysdiode]]r er idag (2006) ligeså effektive som [[lysstofrør]].
Derfor (og pga. af lysdioders lange levetid) erstatter lysdioder i disse år glødepærer i mange sammenhænge, f.eks. som trafiklys.
<ref>[http://www.cree.com/press/press_detail.asp?i=1160427137863 October 9, 2006, Cree Delivers the First 160-Lumen White Power LED] Citat: "...XLamp LEDs now as efficient as fluorescent sources...The new XLamp LED was designed to enable general lighting applications, such as street lighting, retail high bay lighting and parking garage low bay lighting, as well as to vastly improve the light quality in consumer applications such as flashlights..."</ref>
 
 
==Virkningsgrad af lydkilder==
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