| 4.1. |
After the headlamp(s) has been operated for 10 minutes the dirt mixture shall be applied evenly to its entire light emitting surface using the spray gun mentioned above. The mixture shall then be dried either by operating the headlamp or using hot air. This procedure shall be repeated, if necessary until the luminous intensity in all measuring points has been reduced below 20 per cent of the values according to paragraph 3 of this annex. At least the luminous intensity in one of the several measuring points shall be between 15 and 20 per cent. |
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