Circuitry is disclosed for operating with no stroboscopic effects at least three fluorescent lamps connected to a source of single-phase alternating voltage. In order to suppress the stroboscopic effects, the first lamp circuit (1) is connected in the usual way to both conductors (S; Mp) of the source of single-phase alternating voltage; a series oscillating circuit (4) composed of an inductive resistor (L) and a capacitor (C) is arranged in parallel to the first lamp circuit; the second lamp circuit (2) is connected between a conductor (S) of the source of single-phase alternating voltage and the point of connection (Vp) between the inductive resistor (L) and the capacitor (C) of the series oscillating circuit (4); and the third lamp circuit (3) is connected between said point of connection (Vp) and the other conductor (Mp) of the source of single-phase alternating voltage.
