3*1w led down light 1,Cree, Epistar 2,90-120lm/w,1/3/5/7/9/12/15/18w 3,CE&RoHS, 4.2-3years warranty ... supply(commonly known as transformer):Transformer determines the life of lamp,lamp beads with more than 50000hrs no problem,but if the ... to light upElectronic components used in transformers together with the design determine the efficiency of the transformer,also power factor,stability,temperature ...