... rapid start, PF:0.98 THD<17% CCF<1.7 preheat lamp and over voltage protection ,no ... noise 220V-240V 50HZ/60HZ 1. T5 Electronic ballast for T5 lamps, 220-240v ... , 50-60hz2. Function of preheat start, lamp disconnect,short circuit,over voltage, ... . With minivolume and lightweight5. Especially applied to a group of lights fittings6. AC voltage range 170-250v