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    The thermal separation is mainly used for the LED chip MCPCB circuit with no heat sink is electrically connected to the LED light source, heat refers LED heat sink part of the direct heat conduction through the heat conductive pads on the circuit board and the metal base of the metal base, the LED light source power means electrode pad electrode and the metal base circuit board is turned on, an insulating material between the isolated pad electrode and the metal base.  The heat conducting pad function is the thermal conductivity, electrode is the role of conducting.