Abstract: In accordance with the present invention, a control device for energizing a lamp circuit including gaseous discharge lamps includes a power source having a variable amplitude varying in time. A control circuit is provided for producing a variable pulse width control signal. A switch is responsive to the variable pulse width control signal for providing a switched output from the power source. The switched output has a pulse width proportional to the variable pulse width control signal for supplying power to the lamp circuit. An inductor is interconnected between the switch and the lamp circuit. The inductor includes a first winding with a center tap for receiving the switched output from the switch for balancing the voltage and current applied to the lamps within the lamp circuit. The inductor further includes a second winding connected to the lamp circuit for providing constant lamp brightness regardless of amplitude variations in the source voltage.