(iii) If the applicant declares that the headlamp is to be used with only the passing-beam lit or only the front fog lamp[2] lit at a time, the test shall be carried out in accordance with this condition, activating1 successively the principal passing-beam half of the time and the front fog lamp for half of the time specified in paragraph 2.1., while the driving-beam(s) is(are) subjected to a cycle of 15 minutes off and 5 minutes lit for half of the time and during the operation of the principal passing-beam; a0c0