Abstract: For the purpose of controlling the electrical energy fed to an electrical gas-discharge lamp (20), without an incandescent cathode, as a function of a d.c. control voltage (U.sub.S), there is a circuit arrangement (IC1, R3-R11, C4-C6, D-1), by means of which the ignition timing or angle of a triac (TR1) may be varied within each alternating-voltage half-wave. In order to prevent the lamp (20) from being completely extinguished unintentionally, when adjusted to minimal brightness, an additional circuit arrangement (30, 42, R12-R20, C7, D3, T1) is provided, ensuring a given minimal intensity of the current, flowing through said lamp (20), regardless of the level of said d.c. control voltage (U.sub.S). Said additional circuit arrangement comprises a current transformer (30) and a rectifier arrangement (42) for producing a regulating voltage (U.sub.R) dependent upon the intensity of the lamp current which controls an electronically variable resistance (T1).