A moisture exchange module has a bundle of moisture-permeable hollow fiber membranes and at least one line element for supplying a gas stream that flows through the hollow fibers in an inner flow. In one embodiment, the control lines are subdivided into sections, wherein regions free of switching transistors are provided at intervals along the control lines. Therefore, up to five luminary elements are adapted to be supported in the light source unit for increasing the light intensity of the light source arrangement. A calculation unit calculates a derivative efficiency of the laser based on the first and second power sample signals detected by the detection unit, so that the drive currents of the laser driver, supplied to the laser, are controlled based on the calculated derivative efficiency. The information packets are encrypted and decrypted using an integrated software client that combines mobile IP communication support and encrypting and decrypting protocols.