Document ID: chunk:federal_register_of_legislation:F2023C00140:body:0:p9
Version: federal_register_of_legislation:F2023C00140
Segment Type: other
Provision Reference: 
Character Range: 24702–27745

them causes all of them to stop emitting light, shall be considered to be one light source.
8.                                          Apparent surface
The area of the apparent surface in the direction of the axis of reference of the daytime running lamp shall be not less than 25 cm² and not more than 200 cm².
9.                                          Colour of light
The colour of the light shall be white. It shall be measured under the conditions as prescribed in paragraph 10. below.
10.                                      Test procedure
10.1.                                All measurements, photometric and colorimetric, when not supplied by an electronic light source control gear, shall be carried out with an uncoloured or coloured standard light source of the category prescribed for the daytime running lamp, supplied with the voltage:
           (a)   In the case of filament lamps, that is necessary to produce the reference luminous flux required for that category of filament lamp;
           (b)   In the case of LED light sources of 6.75 V, 13.5 V or 28.0 V; the luminous flux value produced shall be corrected. The correction factor is the ratio between the objective luminous flux and the mean value of the luminous flux found at the voltage applied.
10.2.                                In the case of a system that uses an electronic light source control gear being part of the daytime running lamp[3], all measurements, photometric and colorimetric, shall be made applying at the input terminals of the lamp a voltage of 6.75 V, 13.5 V or 28.0 V respectively.
10.3.                                In the case of a system that uses an electronic light source control gear not being part of the daytime running lamp the voltage declared by the manufacturer shall be applied to the input terminals of the daytime running lamp.  The test laboratory shall require from the manufacturer the light source control gear needed to supply the light source and the applicable functions.
The voltage to be applied to the daytime running lamp shall be noted in the communication form in Annex 1 to this Regulation.
10.4.                                For any daytime running lamp except those equipped with filament lamps, 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.
10.5.                                The limits of the apparent surface in the direction of the reference axis of a light-signalling device shall be determined.
11.                                      Heat resistance test
11.1.                                The daytime running lamp shall be subjected to a one-hour test of continuous operation following a warm-up period