HID Ballast 1. Certificates: CE, ROSH, CCC 2. ISO9001, ISO14001 3. Can make according to clients' requirements. HID Ballast:This series of products are matched with high pressure sodium lamps, and have own intellectual property invention patents. Adopt new style design, and have lower loss, that is 6%-20% lower than that of traditional ballast. They have the features of obvious energy saving, ...