... aluminium with thermal coefficient of 201w/m.k 2) Low electricity consumption, energy saving, save 80% electricity3) Low heat emit, touchable4) No ... ADJUSTABLECAP:ALUMINIUM HEAT SINK CAP,DIAMETER 50MM,PLUG:US,EU,UK,AU,JP PLUGLIFETIME:50,000HOURSWARRANTIES:2 YEARS two years warranty1 ...