... work quiet Product Name 400W HID dimmer Electronic ballast for Garden lightOur Advantages:1, Timing Dimmer ballast, High Power Factor, Low THD2, ... protection, short circuit protection and overload protection6, Light weight, small size, easy establish, work quiet, 3 years warranty periodTechnical ... christine [at] intelligon.cnContact: Christine 400W HID dimmer Electronic ballast for Garden light