A light-emitting diode (LED) luminaire control gear comprising a rechargeable battery and a control and test circuit is adopted to provide an emergency power to operate a luminaire that works only in alternate-current (AC) mains. The luminaire comprises LED arrays and a power supply. The LED luminaire control gear further comprises a current-fed converter circuit, a control and test unit, and a relay switch. When a line voltage from the AC mains is unavailable or when a battery discharging test is initiated, the LED luminaire control gear is automatically started to provide a high DC voltage within an input operating voltage range of the luminaire and a low-voltage conversion circuit to control the power supply to operate the LED arrays without strobing. The relay switch is configured to couple either the line voltage or the high DC voltage to the power supply to operate thereon.