High frequency electronic ballast for high intensity discharge lamps and improved drive method there

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A ballast for operating a high intensity discharge (HID) lamp includes a mechanism which provides electrical power to the HID lamp and a frequency-selecting mechanism which selects a frequency of the electrical power based on an atomic component present in the HID lamp. Preferably, the frequency is selected within a range between two hundred kilohertz and nine hundred kilohertz. Preferably, the frequency is near two hundred kilohertz and the operation enhances radiant efficiency at blue-green wavelengths due to excitation states of : scandium, indium, thallium and rare earth elements. Preferably, when the operation frequency is near seven hundred kilohertz, the operation enhances radiant efficiency at red wavelengths due to excitation states of atomic components selected from alkali metals. Preferably, the ballast includes a dimming mechanism for dimming the HID lamp thereby reducing said electrical power, and upon the dimming, the frequency-selecting mechanism selects the frequency for optimizing color parameters and luminous flux of the radiant emission.