Light modulating electronic ballast

The utility model relates to a dimming type electron ballast, which is used for a high-intensity discharge lamp. The electron ballast comprises a gas discharge lamp main loop and a control circuit, wherein the gas discharge lamp main loop is connected with the high-intensity discharge lamp, and the control circuit is connected with the gas discharge lamp main loop; the gas discharge lamp main loop is composed of a low-pass filtering rectifying circuit, a power factor correcting circuit, a bridge type inverted circuit and a T type filter resonance circuit; besides, the control circuit is composed of a dimming signal sampling circuit, a frequency modulation circuit, an isolating driving circuit, a starting control circuit and a starting circuit.