A control algorithm and method to achieve arc stabilization for a gas
discharge lamp having a light transmissive arc tube excitable to a
discharge state upon introduction of a drive signal having a predetermined
frequency associated therewith, includes a discrete modulating algorithm
effective for providing a modulating signal which is imposed onto the
drive signal. The modulating signal has a periodic cycling of discrete
stepped frequencies that minimizes the acoustic resonance of the gases
within the lamp. The control algorithm and method provides an effective
stabilization of the gas discharge lamp's arc throughout the entire
operating range of the lighting system.
