A vacuum cleaner has one or more display indicators on its housing. The indicators are supplied with light from at least one light source assigned thereto in order to optically indicate an operation condition. An electrical component actuates the at least one light source according to the operation condition. In order to create a vacuum cleaner in which the light source can be disposed elsewhere than directly below the display indicators, yet the indicators are nevertheless well illuminated, a light guiding element is disposed between the light source and the display indicators, which redirects the light that is emitted by at least one light source to the display. The assembly provides for the advantage that the distance and the structural differences between the light sources and the display indicators can be easily bridged, so that these functional components do not need to be directly adapted to one another.

 
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> Controlling pulse energy of an optical amplifier by controlling pump diode current

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