Document ID: chunk:federal_register_of_legislation:F2021C00467:body:0:p12
Version: federal_register_of_legislation:F2021C00467
Segment Type: other
Provision Reference: 
Character Range: 32254–35267

pass through the centre of reference. The values shown in the table give, for the various directions of measurement, the minimum intensities in cd.
3.                                          Photometric measurement of lamps equipped with several light sources
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 paragraph 7.1.1. 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 cornering lamp except those equipped with filament lamp(s), the luminous intensities, measured after one minute and after 10 minutes of operation, shall comply with the minimum and maximum requirements. The luminous intensity distributions after one and after 10 minutes of operation shall be calculated from the luminous intensity distribution measured after photometric stability has occurred by applying at each test point the ratio of luminous intensities measured at 45°L 2.5°D for a left-side lamp (the L angle should be substituted for the R angle for a right-side lamp):
(a)  After one minute;
(b)  After 10 minutes; and
(c)  After photometric stability has occurred.
Photometric stability has occurred means the variation of the luminous intensity for the specified test point is less than 3 per cent within any 15 minute period.
Annex 4

Colour of white light

(Chromaticity coordinates)

          1. For checking the colorimetric characteristics, a source of light at a colour temperature of 2,856 K, corresponding to illuminant A of the International Commission on Illumination (CIE), shall be used. For lamps equipped with non-replaceable light sources (filament lamps and other), or light sources (replaceable or non-replaceable) operated together with an electronic light source control gear, the colorimetric characteristics should be verified with the light sources present in the lamp, in accordance with paragraph 7. of this Regulation.
          2. The replaceable light source shall be subjected to the intensity, which