Document ID: chunk:federal_register_of_legislation:F2021C00466:body:0:p13
Version: federal_register_of_legislation:F2021C00466
Segment Type: other
Provision Reference: 
Character Range: 35483–38516

of reference.  The values shown in the table give, for the various directions of measurements, the minimum intensities as a percentage of the minimum required in the axis for each lamp (in the direction H = 0° and V = 0°).
2.2.                                    Within the field of light distribution of paragraph 2. above, schematically shown as a grid, the light pattern should be substantially uniform in so far as the light intensity in each direction of a part of the field formed by the grid lines meets at least the lowest minimum percentage value being shown (available) on the grid lines surrounding the questioned direction.
2.3.                                    However in the case where a device is intended to be installed with its H plane at a mounting height less than 750 mm above the ground, the photometric intensity is verified only up to an angle of 5° downwards.
3.                                          Photometric measurement of lamps
The photometric performance shall be checked:
3.1.                                    For non-replaceable light sources (filament lamps and other):
With the light sources present in the lamp, in accordance with the relevant subparagraph of paragraph 8.1. of this Regulation.
3.2.                                    For replaceable light sources:
When equipped with light sources at 6.75 V, 13.5 V or 28.0 V, the luminous intensity values produced shall be corrected. For filament lamps the correction factor is the ratio between the reference luminous flux and the mean value of the luminous flux found at the voltage applied (6.75 V, 13.5 V or 28.0 V).
For LED light sources the correction factor is the ratio between the objective luminous flux and the mean value of the luminous flux found at the voltage applied (6.75 V, 13.5 V or 28.0 V).
The actual luminous fluxes of each light source used shall not deviate more than ±5 per cent from the mean value. Alternatively and in case of filament lamps only, a standard filament lamp may be used in turn, in each of the individual positions, operated at its reference flux, the individual measurements in each position being added together.
3.3.                                    For any signalling lamp except those equipped with filament lamp(s), the luminous intensities, measured after one minute and after 30 minutes of operation, shall comply with the minimum and maximum requirements. The luminous intensity distribution after one minute of operation can be calculated from the luminous intensity distribution after 30 minutes of operation by applying at each test point the ratio of luminous intensities measured at HV after one minute and after 30 minutes of operation.
Annex 5
Minimum requirements for conformity of production control procedures

4.                                          General
4.1.                                    The conformity requirements shall be considered satisfied from a mechanical and geometric standpoint, if the differences do not exceed inevitable manufacturing deviations