大乐透走势图带坐标连线标准版 www.qxwsvh.com.cn D.O.B refer to Drive On Board. It comes with no traditional driver and capacitor. Its life span is double than regular lightings, and maintenance cost will cut up to 90% after 5 years. It's the future tech of whole LED lighting industry. Jiao Guang is a leading company on it, we are the first manufacture created 110-277V globe voltage D.O.B lighting products, and we also obtained US and China patent.