Many thanks Tibor and please excuse my late response. These were the informations I was looking for.
The circuit board in my light looks exactly like the one on your pictures but with one exception. Instead of the transistor underneath the circuit board my light has a variable resistor connected to the board via two thin wires. Though it looks not really professional made, it works fairly but it seems that it let the motor spin a little too fast. Unfortunately the variable resistor is only sufficient conductive in his upper end position. As soon as you turn down the resistor only a little bit, the motor immediately stopps spinning. So I believe that I have to look for a suitable resistor in the future to bring down the motor speed to a reasonable value.
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