Abstract: A control apparatus for an ac-powered lamp unit includes a charging circuit for generating a constant current output from an ac power source, a storage battery charged by the constant current output and supplying a dc voltage output, a first high-voltage oscillator circuit for converting the dc voltage output of the storage battery into a first high-voltage oscillating signal, a second high-voltage oscillator circuit for generating a dc voltage signal from the ac power source and for converting the dc voltage signal into a second high-voltage oscillating signal, a switch circuit connected to the first and second high-voltage oscillator circuits, and a switch control circuit for controlling the switch circuit to provide the second high-voltage oscillating signal from the second high-voltage oscillator circuit to an ac-powered lamp unit when the ac power source is available, and to provide the first high-voltage oscillating signal from the first high-voltage oscillator circuit to the ac-powered lamp unit in cas