6.2. Daytime running lamps shall be so designed and constructed that in normal use, despite the vibration to which they may then be subjected, they continue to function satisfactorily and retain the characteristics prescribed by this Regulation.
6.3. In the case of light source modules, it shall be checked that:
6.3.1.
The design of the light source module(s) shall be such as:
(a) that each light source module can only be fitted in no other position than the designated and correct one and can only be removed with the use of tool(s);
(b) if there are more than one light source module used in the housing for a device, light source modules having different characteristics can not be interchanged within the same lamp housing.
6.3.2.
The light source module(s) shall be tamperproof.
6.4. Light source module
6.4.1. The design of the light source module(s) shall be such that even in darkness the light source module(s) can be fitted in no other position, but the correct one.
6.4.2. The light source module(s) shall be tamperproof.
6.5. In the case of replaceable filament lamp(s):
6.5.1.
Any category or categories of filament lamp(s) approved according to Regulation No 37 may be used, provided that no restriction on the use is made in Regulation No 37 and its series of amendments in force at the time of application for type approval.
6.5.2.
The design of the device shall be such that the filament lamp can be fixed in no other position but the correct one.
6.5.3.
The filament lamp holder shall conform to the characteristics given in IEC Publication 60061. The holder data sheet relevant to the category of filament lamp used, applies.
7. INTENSITY OF LIGHT
7.1. The luminous intensity of the light emitted by each lamp shall not be less than 400 cd in the axis of reference.
7.2. Outside the reference axis and within the angular fields defined in the arrangement diagram in Annex 6 to this Regulation, the intensity of the light emitted by each lamp must:
7.2.1.
In each direction corresponding to the points in the table of standard light distribution reproduced in Annex 3 to this Regulation, be not less than the minimum specified in paragraph 7.1 above, multiplied by the percentage specified in the said table of the direction in question, and
7.2.2.
not exceed 1 200 cd in any direction the lamp is visible.
7.3. Moreover, throughout the field defined in the diagram in Annex 6, the intensity of the light emitted must not be less than 1,0 cd.
7.4. In the case of a lamp containing more than one light source the lamp shall comply with the minimum intensity required when any one light source has failed and when all light sources are illuminated the maximum intensity shall not be exceeded.
A group of light sources, wired so that the failure of any one of 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 lamp shall be not less than 25 cm
2
and not more than 200 cm
2
.
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.