A power circuit for at least one gas discharge lamp comprising a first filament and a second filament, the power circuit including an electronic driver circuit, preferably for generating a first alternating voltage between the first and second filament for starting up the gas discharge lamp and for generating a second alternating voltage between the first and second filament for having the gas discharge lamp burn after it has been started up, wherein the power circuit further includes an electronic heating circuit for, at least during generation of the second alternating voltage, generating a first current through the first filament for heating the first filament and/or generating a second current through the second filament for heating the second filament.