... 28W/35W): 1. Voltage: 220V/50Hz 2. Power: 1x14W, 1x21W, 1x28W, 1x35W 3. Power Factor: 0.95 T5 Electronic Ballast (14W ... T5 lamps, 220V/50Hz.2. Function of preheat start, lamp disconnect, short circuit, over voltage, lamp unusual, brightness stable with special protection, ... with convenient installation.5. Especially applied to a group of lights fittings. T5 Electronic Ballast (14W/21W/28W/35W)