... .98 THD<17% CCF<1.7 preheat lamp and over voltage protection ,no noise 220V-240V 50HZ/60HZ 1. T5 Electronic ... -60hz2. Function of preheat start, lamp disconnect,short circuit,over voltage,lamp unusual, brightness stable with special protection, etc3. Inserting connection ... and lightweight5. Especially applied to a group of lights fittings6. AC voltage range 170-250v