... 1x21W, 1x28W, 1x35W 3. Power Factor: 0.95 T5 Electronic Ballast (14W/21W/28W/35W):1. T5 electronic ballast for T5 lamps, 220V ... /50Hz.2. Function of preheat start, lamp disconnect ... , short circuit, over voltage, lamp unusual, brightness stable with special protection, etc.3. With mimi volume ...