The massive copper PCB has an outstanding and fast heat dissipation. A further advantage is the direct connection of the LED base with the copper. This contact is possible because of a special open area in the dielectric and increases the PCBs efficiancy even more.
The back side is holohedral golden. This was made to avoid possible oxidation and makes it easy to remove residues of additives or fingerprints.
The copper PCB has a diameter of 16mm and is useable in a wide range of applications like LED torches for example.