A strobe device is used to affect brain wave patterns, such as for personal defense by causing disorientation, or for therapeutic use by causing calming. In order to optimize the flexural strength, load bearing capacity and crash behavior of a longitudinal girder within a given construction area, the inventive longitudinal girder consists of two hollow profiles which are disposed at a heightwidth ratio of approximately 1 and which are connected to each other on both ends thereof in a dimensionally stable manner. In a preferred embodiment, the base is permanently fixed to the tubular portion by adhesive sealing material disposed between the threads attaching the base and cap to the tubular portion. The electronic component cover may comprise one or more leads adapted to provide electrical communication between the first electronic component and the second electronic component.