The circuit board is needed to build an LED module to your own wishes. On the top of the circuit board can be mounted different LEDs. You can stick on the LEDs with thermal glue or thermal pad. The bottom side of the circuit board has contact surfaces and connects the contact with the battery tube.
The circuit board dissipates the heat of the LEDs. An additional cooling plate is not needed .
TIP : Various reflectors / lenses of different beam angles are available on request.
