Importance

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Abstract

A method for operating a lighting device which has a plurality of light sources includes ascertaining a measure of a supply voltage, switching the light sources into one or more parallel strings. The light sources are in each case connected in series in each string, depending on the supply voltage. The method further includes automatically ascertaining a number of light sources in at least one of the strings. The number corresponds to the largest integer number which, multiplied by a prespecifiable forward voltage of each of the light sources, is less than the supply voltage. When the light sources are switched into the at least one string precisely the number of light sources are connected in series. A switch is connected in parallel with each of the light sources, and either a variable resistor or a variable resistor is connected in series with each string of light sources.

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First Claim