... of oxidation reaction.Led base:RED COPPER BASE,high thermal conductivity ,reach 450k/m.w (copper only 300k/m.w Service ... Epistar35mil,Taiwan Genesis,Taiwan Epileds.Available color :white,blue,red ,green,yellow,orange,rgb,uv Available CCT :2000-2200k ... performance in lumens,better light-emitting uniformity.Led base:red/black copper base ,for better thermal conductive/cooling ,thermal conductivity ...