1)2.5" 3w cob led downlight 2)New,nice.high quality with diamond cup 3)Round,3w-18w 4)CE&RoHS;CCC 5 ... ,lightweight easy,elegant,easy to install and replace 6,Streamline design,beautiful appearance 7,Energy and durable(consuming only ordinary incandescent ... light up Electronic components used in transformers together with the design determine the efficiency of the transformer,also power factor,stability ...