In one embodiment, a high frequency quasi optical oscillator power source is provided which includes an array of amplifier devices each having an input antenna tuned for a fundamental frequency. A multi-layer metal screen for defining a first fluid cavity is placed in contact with the outer face of the anode, and an electrically-conductive, compressible, spring-like, porous pad for defining a second fluid cavity is placed in contact with the outer face of the cathode. The variations in fluid pressure create cavitational bubbles and eddies of internal pressure, which result in long-term, stable and ultra-thin emulsions and dispersions of the fluidic medium. The cap defines a passage extending from an open end, and is mounted to the stationary wall such that the open end is open relative to a stationary wall inner face. The first hash value is compared with the stored plurality of address the hash values. To increase the functionality of the brake light system an in particular the safety of the vehicle equipped with it, at least one lighting means for emitting rear fog light is arranged in the light casing.