A process for producing a filmy graphite includes the steps of forming a polyimide film having a birefringence of 0. Advantageously, the second test is applied directly after the first test. The two circuits in combination produce a sufficient current flow to operate an LED load circuit and to cause a conventional vehicle flasher unit to be operated normally. The central reflective portion and the outer reflective portion of the cover lens can be integrated with a joint portion of the same material. Responsive to the signal, the control unit applies an electrical waveform to the electrode, so as to inhibit the incontinence.