Luminous intensity. 4.3.1.1. A photometric measurement of the device shall be made after 1 minute of operation for the specific function at the test point specified below. For these measurements, the aim can be approximate but must be maintained for before and after ratio measurements. Test points to be measured: Passing-beam: 25R in case of headlamps of classes A, B and D 50V in case of headlamps of classes AS, BS, CS, DS, ES 25RR in case of AFS Driving-beam: H – V Front fog lamps: horizontal 0° vertical 2.5°D 4.3.1.2. The lamp shall continue operation until photometric stability has occurred. The moment at which the photometry is stable is defined as the point in time at which the variation of the photometric value is less than 3 per cent within any 15 minutes period. After stability has occurred, aim for complete photometry shall be performed in accordance with the requirements of the specific device. Photometer the lamp at all test points required for the specific device. 4.3.1.3. Calculate the ratio between the photometric test point value determined in paragraph 4.3.1.1. and the point value determined in paragraph 4.3.1.2. 4.3.1.4. Once stability of photometry has been achieved, apply the ratio calculated above to each of the remainder of the test points to create a new photometric table that describes the complete photometry based on one minute of operation. 4.3.1.5. The luminous intensity values, measured after one minute and after photometric stability has occurred, shall comply with the minimum and maximum requirements.
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Sources: Agreement Concerning the Adoption of Harmonized Technical United Nations Regulations, Agreement Concerning the Adoption of Harmonized Technical United Nations Regulations for Wheeled Vehicles