UN-R123/02 (Rev.2)

"Class" of a passing-beam (C, V, E or W) means the designation of a passing-beam, identified by particular provisions according to this Regulation and Regulation No. 48;[1]

References made in this Regulation to standard (étalon) filament lamp(s) and gas-discharge light source(s) shall refer to Regulations Nos. 37 and 99 respectively, and to their series of amendments in force at the time of application for type approval.

(e) Which set(s) of Class W passing-beam provisions according to Annex 3 to this Regulation apply, if any;

(b)Indicates the instructions for their verification according to paragraph 6.2.7. below; and/or

(c)Gives access to the relevant documents demonstrating the system's performance concerning sufficient reliability and safe operation of the measures specified according to the sub-paragraph 2.2.2.1. (a) above, e.g. FMEA ("Failure Mode and Effect Analysis"), FTA ("Fault Tree Analysis") or any similar process appropriate to system safety considerations.

least 60 x 80 mm in size, having a flat or convex outer surface and a substantially flat area (radius of curvature not less than 300 mm) in the middle measuring at least 15 x 15 mm;

For testing the resistance of the light transmitting components made of plastic material against UV radiation of those light source(s) inside the system, which can emit UV radiation as e.g. gas discharge light sources, LED modules, according to paragraph 2.2.4. of Annex 6 to this Regulation:

This specific identification code shall comprise the starting letters "MD" for "MODULE" followed by the approval marking without the circle as prescribed in paragraph 4.2.1. below and in the case several non-identical light source modules are used, followed by additional symbols or characters. This specific identification code shall be shown in the drawings mentioned in paragraph 2.2.1. above. The approval marking does not have to be the same as the one on the lamp in which the module is used, but both markings shall be from the same applicant.

If all the samples of a type of a system submitted pursuant to paragraph 2. above satisfy the provisions of this Regulation, approval shall be granted.

In addition to the mark prescribed in paragraph 3.1., an approval mark as described in paragraphs 4.2. and 4.3. below shall be affixed in the spaces referred to in paragraph 3.2. above to every installation unit of a system conforming to a type approved under this Regulation.

The applicant shall indicate in a form corresponding to the respective model in the Annex 1 to this Regulation, the vehicle(s) for which the system is intended.

The applicant shall submit sufficient documentation to prove the capability of the system to comply with the provisions of paragraph 6.22. of Regulation No. 48 when correctly installed, and

The system shall be approved according to Regulation No. 10.

on an installation unit contributing to fulfill the requirements of this Regulation in respect of the driving-beam, an indication of the maximum luminous intensity expressed by the reference mark, as defined in paragraph 6.3.2.1.2. below, placed near the circle surrounding the letter "E";

In every case the relevant operating mode used during the test procedure according to paragraph 1.1.1.1. of Annex 4 and the permitted voltage(s) according to paragraph 1.1.1.2. of Annex 4 shall be stipulated on the approval forms and on the communication forms transmitted to the countries which are Contracting Parties to the Agreement and which apply this Regulation.

On an installation unit meeting the requirements of Annex 4 to this Regulation only when supplied with a voltage of 6 V or 12 V, a symbol consisting of the number 24 crossed out by an oblique cross (X), shall be placed near the holders of the light source(s).

Annex 2, Figures 1 to 10, to this Regulation gives examples of arrangements of the approval mark with the above-mentioned additional symbols.

Each sample, when its approval is sought for right-hand traffic only, shall conform to the specifications set forth in paragraphs 6. and 7. below; if, however, its approval is sought for left-hand traffic, the provisions of paragraph 6. below, including the relevant annexes to this Regulation, apply with the inversion of right to left and vice versa.

Complementary tests shall be done according to the requirements of Annex 4 to this Regulation to ensure that in use there is no excessive change in photometric performance.

If the lens of a lighting unit is of plastic material, tests shall be done according to the requirements of Anne 6 to this Regulation.

Except in the case of adaptation of the driving-beam, either the passing-beam or the driving-beam shall always be obtained, without any possibility of remaining in an intermediate or undefined state; if this is not possible, such a state must be covered by the provisions according to paragraph 5.7.3. below;

In the case of failure it must be possible to obtain automatically a passing-beam or a state with respect to the photometric conditions which yields values not exceeding 1,300 cd in the zone III b as defined in Annex 3 to this Regulation and at least 3,400 cd in a point of "segment Emax", by such means as e.g. switching off, dimming, aiming downwards, and/or functional substitution;

Be capable of providing a selective setting by the user according to paragraph 5.4. above, without special tools; or

The system shall be so made that, if a light source and/or a LED module has failed, a failure signal in order to comply with the relevant provisions of Regulation No. 48 shall be provided.

The system shall be accompanied by a copy of the form according to paragraph 4.1.4. above and instructions to enable its installation according to the provisions of Regulation No. 48.

To confirm compliance with the provisions of paragraph 6.22.7.4. of Regulation No. 48 a test drive is mandatory, which comprises any situation relevant to the system control on the basis of the applicant's description. It shall be notified whether all modes are activated, performing and de-activated according to the applicant's description; obvious malfunctioning, if any, to be contested (e.g. angular excess or flicker).

The AFS, if equipped with LED module(s), and the LED module(s) themselves shall comply with the relevant requirements specified in Annex 11 to this Regulation. The compliance with the requirements shall be tested.

In case of an AFS incorporating light sources and/or LED module(s) producing the basic passing-beam and having a total objective luminous flux of the lighting units as indicated under item 9.3 of the communication form conforming to the model in Annex 1 which exceeds 2,000 lumens per side a reference shall be made in item 9.2.3. of the communication form in Annex 1. The objective luminous flux of LED module(s) shall be measured as described in paragraph 5. of Annex 11.

In the case of the basic passing-beam in the neutral state being produced exclusively by LED modules, the total objective luminous flux of these LED modules shall be equal or greater than 1,000 lumen per side, when measured as described in paragraph 5. of Annex 11.

Each system shall provide a Class C passing-beam according to paragraph 6.2.4. below and one or more passing-beam(s) of additional class(es); it may incorporate one or more additional modes within each class of passing-beam and the front-lighting functions according to paragraph 6.3. and/or 2.1.1.1. of this Regulation.

At V-signal, W-signal, E-signal, T-signal according to paragraph 1.10. of this Regulation, whichever apply;

In case of a headlamp using a gas-discharge light source with the ballast not integrated with the light source, four seconds after ignition of a headlamp that has not been operated for 30 minutes or more:

At least 37,500 cd shall be attained at point HV, for a system producing driving-beam only.

At least 3,100 cd shall be attained at point 50 V when the Class C passing-beam is activated, for systems producing passing-beam only or alternately producing passing-beam and driving-beam functions as described in paragraph 5.7. of this Regulation.

Annex 8 does not apply to the traffic-change function as described in paragraph 5.8. through 5.8.2.1. above.

The system or part(s) thereof shall be aimed according to the requirements of Annex 8 so that the position of the cut-off complies with the requirements indicated in the Table 2 of Annex 3 to this Regulation.

When the T-signal corresponds to the vehicle's smallest turn radius to the left (or right), the sum of the luminous intensity values provided by all contributors of the right or the left side of the system shall be at least 2,500 cd at one or more points in the zone extending from H-H to 2 degrees below H-H and from 10 to 45 degrees left (or right).

If approval is sought for a category 1 bending mode, the use of the system is restricted to vehicles where provisions are taken such that the horizontal position of the "kink" of the "cut-off" which is provided by the system, complies with the relevant provisions of paragraph 6.22.7.4.5.(i) of Regulation No. 48;

However, this is not needed if, for positions relative to the system reference axis up to 5 degrees left, at 0.3 degree up from H-H, and greater than 5 degrees left, at 0.57 degree up, a value of 880 cd is in no case exceeded.

Any specified passing-beam mode provides at least 2,500 cd at point 50V from each side of the system;

Any lighting unit(s) which is/are not independently adjustable, or, for which the aiming was done with respect to any measurements under paragraphs 6.2., shall be tested in its/their unchanged position.

The point of intersection (HV) of lines h-h and v-v shall be situated within the isolux 80 per cent of maximum luminous intensity (I_max)

The reference mark (I'_M) of this maximum intensity, referred to in paragraph 4.2.2.9. above, shall be obtained by the ratio:

The system meets the requirements of the paragraphs 6.3.2.1.1. and 6.3.2.1.2. above with each lighting unit measured according to the relevant procedure indicated in Annex 9.

If the specified beam requirements are not met, a re-aiming of the beam position within 0.5 degree up or down and/or 1 degree to the right or left, with respect to its initial aiming is allowed; in the revised position all photometric requirements shall be met. These provisions do not apply to lighting units as indicated under paragraph 6.3.1.1. of this Regulation.

During adaptation, the driving-beam function shall meet the requirements for all the cases of right-hand and left-hand traffic specified in Part A of Table 7 in Annex 3 to this Regulation. These requirements shall be verified during the type approval testing in conjunction with a signal generator to be provided by the applicant. This signal generator shall reproduce the signals provided by the vehicle and cause the adaptation of the driving-beam and in particular shall represent the settings so that the photometric compliance can be verified.

In the case of a system or part(s) thereof with adjustable lighting units the requirements of paragraphs 6.2. (passing-beam) and 6.3. (driving-beam) are applicable for each mounting position indicated according to paragraph 2.1.3. of this Regulation (adjustment range). For verification the following procedure shall be used:

With the system or part(s) thereof initially fixed according to paragraph 6.4.1. above, the device or part(s) thereof must meet the relevant photometric requirements of paragraphs 6.2. and 6.3. above;

Additional tests shall be made after the reflector/system or part(s) thereof has been moved vertically 2 degrees or at least into the maximum position if less than 2 degrees, from its initial position by means of the system or part(s) thereof adjusting device. Having re-aimed the system or part(s) thereof as a whole (by means of the goniometer for example) in the corresponding opposite direction the light output in the following directions shall be controlled and lie within the required limits:

If the applicant has not asked for special mounting positions, the system or part(s) thereof shall be aimed for measurements of paragraphs 6.2. (passing-beam) and 6.3. above (driving-beam) with the relevant adjusting device(s) of the system or part(s) thereof in its mean position. The additional test of paragraph 6.4.3. above shall be made with the system or part(s) thereof, moved into its extreme positions (instead of  2 degrees) by means of the relevant adjusting device(s).

It shall be stated by means of a form conforming to the model in Annex 1 to this Regulation, which lighting unit(s) provide a "cut-off" as defined in Annex 8 to this Regulation, that projects into a zone extending from 6 degrees left to 4 degrees right and upwards from a horizontal line positioned at 0.8 degree down.

The Type Approval Authority issuing the extension of approval shall assign a series number to each communication form drawn up for such an extension and inform thereof the other Parties to the 1958 Agreement applying this Regulation by means of a communication form conforming to the model in Annex 1 to this Regulation.

If a Contracting Party to the Agreement applying this Regulation withdraws an approval it has previously granted, it shall forthwith so notify the other Contracting Parties applying this Regulation by means of a communication form conforming to the model in Annex 1 to this Regulation.

If the holder of the approval completely ceases to manufacture a type of system approved in accordance with this Regulation, he shall so inform the Type Approval Authority, which granted the approval. Upon receiving the relevant communication, that Authority shall inform thereof the other Contracting Parties to the 1958 Agreement applying this Regulation by means of a communication form conforming to the model in Annex 1 to this Regulation.

Total objective luminous flux as described in paragraph 5.13 exceeds 2,000 lumens: yes/no[2]

(a)Indications according to paragraph 6.4.6. of this Regulation (which lighting unit(s) provide a "cut-off" as defined in Annex 8 to this Regulation, that projects into a zone extending from 6 degrees left to 4 degrees right and upwards from a horizontal line positioned at 0.8 degree down)

(b)The adjustment of the "cut-off" has been determined at 10 m / 25 m[2].

(c)The determination of the minimum sharpness of the "cut-off" has been carried out at 10 m / 25 m[2]

Whether approval is sought for a system intended to be installed on vehicles only, which provide means for a stabilization/limitation of the system's  supply: yes/no[2]

The adjustment of the "cut-off" has been determined at 10 m / 25 m[2].

The determination of the minimum sharpness of the "cut-off" has been carried out at 10 m / 25 m[2].

Distinguishing number of the country which has granted/refused/withdrawn approval (see approval provisions in the Regulation).

Mode No. C 1 Mode No. V  Mode No. E  Mode No. W  

Mode No. C  Mode No. V  Mode No. E  Mode No. W  

Mode No. C  Mode No. V  Mode No. E  Mode No. W  

Main beam mode No. M__

Main beam mode No. M__

The installation unit of a system, bearing one of the above approval marks has been approved in the Netherlands (E 4) pursuant to this Regulation under approval number 19243, meeting the requirements of this Regulation in its original form (00). The passing-beam is designed for right-hand traffic only. The letters "CT" (Figure 1) indicate that it concerns a passing-beam with bending mode and the letters "CWR" (Figure 2) indicate that it concerns a Class C passing-beam and a Class W passing-beam and a driving-beam.

Number 30 indicates that the maximum luminous intensity of the driving-beam is between 123,625 and 145,125 candelas.

Figures 4a and 4b: Class C passing-beam with Class V passing-beam for both traffic systems by means of an appropriate adjustment of the setting of the optical element or the light source on the vehicle, and a driving-beam. Class C passing-beam, Class V passing-beam and driving-beam comply to bending lighting provisions, as indicated by the letter "T". The score above the letter "R" indicates that the driving-beam function is provided by more than one installation unit on that side of the system.

A front position lamp approved in accordance with the 02 series of amendments of Regulation No. 7;

One or more lighting unit(s), with a Class C passing-beam with bending mode provided to work with one or more other installation unit(s) on the same side of the system (as indicated by the score above the letter "C") and a Class V passing-beam, both designed for right- and left-hand traffic and a driving-beam with a maximum intensity comprised between 123625 and 145125 candelas approved in accordance with the requirements of this Regulation in its original form (00) and incorporating a lens of plastic material;

A daytime running light approved in accordance with the original version of Regulation No. 87;

A front direction indicator lamp of category 1a approved in accordance with the 01 series of amendments to Regulation No. 6.

A front fog lamp approved in accordance with the 02 series of amendments to Regulation No. 19, or a Class C passing-beam with bending mode, designed for right- and left-hand traffic, provided to work with one or more other installation unit(s) on that side of the system, as indicated by the score above the letter "C".

The installation unit 1 (or 2) of the system bearing the above approval marks meeting the requirements of this Regulation (00 series of amendments) in respect of both a Class C passing-beam for left-hand traffic and a driving-beam with a maximum luminous intensity comprised between 123,625 and 145,125 candelas (indicated by the number 30), grouped with a front direction indicator lamp of category 1a, approved in accordance with the 01 series of amendments of Regulation No. 6.

The installation unit 3 (or 4) of the system is designed to provide the second part of the Class W passing-beam on that side of the system (as indicated by the score above the letter "W"), and the Class V passing-beam.

The system bearing the above approval marks meets the requirements of this Regulation (original version of the Regulation) in respect of both a passing-beam for left-hand traffic and a driving-beam with a maximum intensity comprised between 86,250 and 101,250 candelas (as indicated by the number 30) grouped with a front direction indicator lamp of category 1a, approved in accordance with the 01 series of amendments of Regulation No. 6 and a front position lamp approved in accordance with the 02 series of amendments of Regulation No. 7.

The installation unit 3 of the system (left side) is designed to provide the second part of the Class C passing-beam of that side (as indicated by the score above the letter "C") and a Class W passing-beam.

The LED module bearing the light source module identification code shown above has been approved together with an AFS initially approved in Italy (E 3) under approval number 17325.

Requirements concerning the adaptation of the driving-beam according to paragraph 6.3.7. of this Regulation

In the case where the passing-beam, which meets the requirements of paragraph 6.2. of this Regulation, is continuously operated in conjunction with the adaptation of the driving-beam, the photometric requirements in Part B of the Table 7 shall not be applied.

(a) In a dry and still atmosphere at an ambient temperature of 23 °C ± 5 °C, the test sample being mounted on a base representing the correct installation on the vehicle;

(b) In case of replaceable light sources: using a mass production filament light source, which has been aged for at least one hour, or a mass production gas-discharge light source, which has been aged for at least 15 hours or a mass production LED module which has been aged for at least 48 hours and cooled down to ambient temperature before starting the tests as specified in this Regulation. The LED modules supplied by the applicant shall be used;

Each test sample shall be operated for 12 hours as described in paragraph 1.1.1. and checked as prescribed in paragraph 1.1.2. below.

(a)In the case where a test sample is designed to provide only one lighting function (driving-beam or passing-beam) and not more than one class in case of passing-beam, the corresponding light source(s) is/are lit for the time[1] specified in paragraph 1.1. above;

(d)In the case of a test sample designed to provide a passing-beam bending mode or a mode or function which is activated for a short time with an additional light source being energized, said light source shall simultaneously be switched on for 1 minute, and switched off for 9 minutes during the activation of the passing-beam only, specified in (a) or (b) above.

(a)In case of replaceable filament light source( s) operated directly under vehicle voltage system conditions: the test shall be performed at 6.3 V, 13.2 V or 28.0 V as applicable, except if the applicant specifies that the test sample may be used at a different voltage. In this case, the test shall be carried out with the filament light source operated at the highest voltage that can be used.

(c) In the case of non-replaceable light source operated directly under vehicle voltage system conditions: All measurements on lighting units equipped with non-replaceable light sources (filament light sources and/or others) shall be made at 6.3V, 13.2V or 28.0 V or at other voltages according to the vehicle voltage system as specified by the applicant respectively.

(f) Where signalling lamps are grouped, combined or reciprocally incorporated into the test sample and operating at voltages other than the nominal rated voltages of 6 V, 12 V or 24 V respectively, the voltage shall be adjusted as declared by the manufacturer for the correct photometric functioning of that lamp.

After being tested as specified in paragraph 1.1. above, the test sample shall be operated for one hour as described in paragraph 1.1.1. for each function or class of passing-beam,[4] after being prepared as prescribed in paragraph 1.2.1., and checked as prescribed in paragraph 1.1.2.; after each test a sufficient cooling down period must be assured.

an appropriate quantity of distilled water with a conductivity of less than 1 μS/m.

For the purpose of this test, the voltage shall be adjusted as specified in paragraph 1.1.1.2. above.

The test sample shall be operated and tested on Class C passing-beam, Class V passing-beam, Class E passing-beam and Class W passing-beam, whatever applies.

The result expressed in milliradians (mrad) shall be considered as acceptable for a passing beam headlamp when the absolute value Δ r₁ = | r₃ - r₆₀| recorded on the headlamp is not more than 1.0 mrad (Δ r₁≤ 1.0 mrad) upward and not more than 2.0 mrad (Δ r₁ 2.0 mrad) downwards.

With respect to photometric performances, the conformity of mass- produced systems shall not be contested if, when testing photometric performances of any system chosen at random and equipped with a light source energized, and if applicable corrected, as prescribed in paragraphs 1. and 2. of Annex 9 to this Regulation:

No value measured and corrected according to the prescriptions of paragraph 2. of Annex 9 to this Regulation deviates unfavourably by more than 20 per cent from the value prescribed in this Regulation:

For the driving-beam, HV being situated within the isolux 0.75 I_max, a tolerance of +20 per cent for maximum values and -20 per cent for minimum values is observed for the photometric values at any measuring point specified in paragraph 6.3.2. of this Regulation.

If the results of the test described above do not meet the requirements, the alignment of the system may be changed, provided that the axis of the beam is not displaced laterally by more than 0.5 degree to the right or left and not by more than 0.2 degree up and down, each independently and with respect to the first aiming.

These provisions do not apply to lighting units as indicated under paragraph 6.3.1.1. of this Regulation.

If the results of the tests described above do not meet the requirements, tests shall be repeated using another standard (étalon) light source and/or another supply and operating device.

One of the sampled systems shall be tested according to the procedure described in paragraph 2.1. of Annex 4 after being subjected three consecutive times to the cycle described in paragraph 2.2.2. of Annex 4.

The system shall be considered as acceptable if Δr does not exceed 1.5 mrad.

If this value exceeds 1.5 mrad but is not more than 2.0 mrad, a second sample shall be subjected to the test after which the mean of the absolute values recorded on both samples shall not exceed 1.5 mrad.

The criteria governing acceptability shall be such that, with a confidence level of 95 per cent, the minimum probability of passing a spot check in accordance with Annex 7 (first sampling) would be 0.95.

The set of samples of complete systems or part thereof supplied pursuant to paragraph 2.2.3. of this Regulation and incorporating lenses of plastic material shall, with regard to the lens material, satisfy the specifications indicated in paragraph 2.6. below.

The samples of lenses of plastic material or samples of material shall be subjected, with the reflector to which they are intended to be fitted (where applicable), to approval tests in the chronological order indicated in Table A reproduced in Appendix 1 to this annex.

However, if the system manufacturer can prove that the product has already passed the tests prescribed in paragraphs 2.1. to 2.5. below, or the equivalent tests pursuant to another Regulation, those tests do not need to be repeated; only the tests prescribed in Appendix 1, Table B, shall be mandatory.

Three new samples (lenses) shall be subjected to five cycles of temperature
and humidity (RH = relative humidity) change in accordance with the
following programme:
 3 hours at 40 °C ± 2 °C and 85-95 per cent RH;
 1 hour at 23 °C ± 5 °C and 60-75 per cent RH;
15 hours at –30 °C ± 2 °C;
 1 hour at 23 °C ± 5 °C and 60-75 per cent RH;
 3 hours at 80 °C ± 2 °C;
 1 hour at 23 °C ± 5 °C and 60-75 per cent RH;
Before this test, the samples shall be kept at 23 °C ± 5 °C and 60-75 per cent
RH for at least four hours.
Note: The periods of one hour at 23 °C ± 5 °C shall include the periods of
transition from one temperature to another which are needed in order to avoid
thermal shock effects.

Resistance to atmospheric agents
Three new samples (lenses or samples of material) shall be exposed to radiation from a source having a spectral energy distribution similar to that of a black body at a temperature between 5,500 K and 6,000 K. Appropriate filters shall be placed between the source and the samples so as to reduce as far as possible radiation with wave lengths smaller than 295 nm and greater than 2,500 nm. The samples shall be exposed to an energetic illumination of 1,200 W/m2 ± 200 W/m2 for a period such that the luminous energy that they receive is equal to 4,500 MJ/m2 ± 200 MJ/m2. Within the enclosure, the temperature measured on the black panel placed on a level with the samples shall be 50 °C ± 5 °C. In order to ensure a regular exposure, the samples shall revolve around the source of radiation at a speed between 1 and 5 min-1.
The samples shall be sprayed with distilled water of conductivity lower than 1 mS/m at a temperature of 23 °C ± 5 °C, in accordance with the following cycle:
Spraying: 5 minutes; drying: 25 minutes.

After the test described in paragraph 2.2.1. above and the measurement described in paragraph 2.2.3.1. below have been carried out, the outer face of the said three samples shall be treated as described in paragraph 2.2.2.2. with the mixture defined in paragraph 2.2.2.1. below.

The test mixture shall be composed of 61.5 per cent n-heptane, 12.5 per cent toluene, 7.5 per cent ethyl tetrachloride, 12.5 per cent trichloroethylene and 6 per cent xylene (volume per cent).

Soak a piece of cotton cloth (as per ISO 105) until saturation with the mixture defined in paragraph 2.2.2.1. above and, within 10 seconds, apply it for 10 minutes to the outer face of the sample at a pressure of 50 N/cm2, corresponding to an effort of 100 N applied on a test surface of 14 x 14 mm.

At the end of the application of the test mixture, the samples shall be dried in the open air and then washed with the solution described in paragraph 2.3.
(Resistance to detergents and hydrocarbons) at 23 °C ± 5 °C. Afterwards the samples shall be carefully rinsed with distilled water containing not more than 0.2 per cent impurities at 23 °C ± 5 °C and then wiped off with a soft cloth.

After the test of resistance to atmospheric agents, the outer face of the samples shall be free from cracks, scratches, chipping and deformation, and the mean variation in transmission Δt=(T₂-T₃)/T₂ measured on the three samples according to the procedure described in Appendix 2 to this annex shall not exceed 0.020 (Δt_m < 0.020).

After the test of resistance to chemical agents, the samples shall not bear any traces of chemical staining likely to cause a variation of flux diffusion, whose mean variation Δd =(T₅-T₄)/T₂ measured on the three samples according to the procedure described in Appendix 2 to this annex shall not exceed 0.020 (Δd_m < 0.020).

The outer face of three samples (lenses or samples of material) shall be heated to 50 °C ± 5 °C and then immersed for five minutes in a mixture maintained at 23 °C ± 5 °C and composed of 99 parts distilled water containing not more than 0.02 per cent impurities and one part alkylaryl sulphonate.

At the end of the test, the samples shall be dried at 50 °C ± 5 °C. The surface of the samples shall be cleaned with a moist cloth.

The outer face of these three samples shall then be lightly rubbed for one minute with a cotton cloth soaked in a mixture composed of 70 per cent n-heptane and 30 per cent toluene (volume per cent), and shall then be dried in the open air.

After the above two tests have been performed successively, the mean value of the variation in transmission Dt=(T₂-T₃)/T₂ measured on the three samples according to the procedure described in Appendix 2 to this annex shall not exceed 0.010 (Dt_m ≤ 0.010).

The outer face of the three new samples (lenses) shall be subjected to the uniform mechanical deterioration test by the method described in Appendix 3 to this annex.

In transmission: Δt = (T₂-T₃) / T₂

And in diffusion:Δd = (T₅-T₄) / T₂

Shall be measured according to the procedure described in Appendix 2 in the area specified in paragraph 2.2.4.1.1. of this Regulation. The mean value of the three samples shall be such that:

Use an adhesive tape with a force adhesion of 2 N /(cm of width) ± 20 per cent measured under the standardized conditions specified in Appendix 4 to this annex. This adhesive tape, which shall be at least 25 mm wide, shall be pressed for at least five minutes to the surface prepared as prescribed in paragraph 2.5.1. above.

Then the end of the adhesive tape shall be loaded in such a way that the force of adhesion to the surface considered is balanced by a force perpendicular to that surface. At this stage, the tape shall be torn off at a constant speed of 1.5 m/s ± 0.2 m/s.

The lens of system sample No. 1 shall be subjected to the test described in paragraph 2.4.1. above.

The lens of installation unit sample No. 2 shall be subjected to the test described in paragraph 2.5. above.

After the test for resistance to chemical agents and the test for resistance to detergents and hydrocarbons, the outer face of the samples exhibits no cracks, chipping or deformation visible to the naked eye (see paragraphs 2.2.2., 2.3.1. and 2.3.2. of this annex);

After the test described in paragraph 2.6.1.1. above, the photometric values at the points of measurement considered in paragraph 2.6.1.2. are within the limits prescribed for conformity of production by this Regulation.

Tests on plastic materials (lenses or samples of material supplied pursuant to paragraph 2.2.4. of this Regulation)

Tests on complete systems or part(s) thereof (supplied pursuant to paragraph 2.2.3. of this Regulation).

The beam of a collimator K with a half divergence β /2 = 17.4 x 10^-4rad is limited by a diaphragm D _τ with an opening of 6 mm against which the sample stand is placed.

A convergent achromatic lens L₂, corrected for spherical aberrations links the diaphragm D_τ with the receiver R; the diameter of the lens L₂ shall be such that it does not diaphragm the light diffused by the sample in a cone with a half top angle of β/2 = 14 degrees.

An annular diaphragm D_D, with angles a₀/2 = 1 deg and a_max/2°= 12 degrees is placed in an image focal plane of the lens L₂.

The spray gun used shall be equipped with a nozzle 1.3 mm in diameter allowing a liquid flow rate of 0.24 ± 0.02 l/minute at an operating pressure of 6.0 bars -0/+0.5 bar.

be 170 mm ± 50 mm in diameter on the surface exposed to deterioration, at a distance of 380 mm ± 10 mm from the nozzle.

Silica sand of hardness 7 on the Mohr scale, with a grain size between 0 and 0.2 mm and an almost normal distribution, with an angular factor of 1.8 to 2;

Water of hardness not exceeding 205 g/m³ for a mixture comprising 25 g of sand per litre of water.

The deterioration shall be checked by means of one or more samples of glass placed as a reference near the lenses to be tested. The mixture shall be sprayed until the variation in the diffusion of light on the sample or samples measured by the method described in Appendix 2, is such that: Dd = (T₅-T₄)/ T₂ = 0.0250 ± 0.0025.

The ambient conditions shall be at 23 °C ± 5 °C and 65 ± 15 per cent relative humidity.

Before the test, the sample roll of adhesive tape shall be conditioned for 24 hours in the specified atmosphere (see paragraph 3. above).

The test shall be performed under the ambient conditions specified in paragraph 3. Above.

Take the five test pieces while unrolling the tape radially at a speed of approximately 300 mm/s, then apply them within 15 seconds in the following manner:

Leave the assembly in the specified atmospheric conditions for 10 minutes.

Fix the plate and fold back the free end of the tape at 90 degrees. Apply force in such a manner that the separation line between the tape and the plate is perpendicular to this force and perpendicular to the plate.

Pull to unstick at a speed of 300 mm/s ± 30 mm/s and record the force required.

No value deviates unfavourably by more than 20 per cent from the value prescribed in this Regulation;

(a)Maximum values at point B50L 170 cd equivalent 20 per cent and 255 cd equivalent 30 per cent;

(b)Maximum values at zone III and segment BLL: 255 cd equivalent 20 per cent and 380 cd equivalent 30 per cent;

(c) Maximum values at segments E, F1, F2 and F3: 170 cd equivalent 20 per cent and 255 cd equivalent 30 per cent;

For the driving-beam, HV being situated within the isolux 0.75 I_max, a tolerance of +20 per cent for maximum values and -20 per cent for minimum values is observed for the photometric values at any measuring point specified in paragraph 6.3.2. of this Regulation.

If the results of the test described above do not meet the requirements, the alignment of the system may be changed, provided that the axis of the beam is not displaced laterally by more than 0.5 degree to the right or left and not by more than 0.2 degree up and down. These provisions do not apply to lighting units as indicated under paragraph 6.3.1.1. of this Regulation.

If the results of the tests described above do not meet the requirements, tests shall be repeated using another standard (étalon) light source and/or another supply and operating device.

In the first sampling four systems are selected at random. The first sample of two is marked A, the second sample of two is marked B.

One of the systems of sample A after sampling procedure in Figure 1 of this annex shall be tested according to the procedure described in paragraph 2.1. of Annex 4 after being subjected three consecutive times to the cycle described in paragraph 2.2.2. of Annex 4.

In each case the "elbow - shoulder" part shall have a sharp edge.

The beam shall be visually aimed by means of the "cut-off" (see Figure 1 below). The aiming shall be carried out using a flat vertical screen set up at a distance of 10 m or 25 m (as indicated in section 9 of Annex 1) forward of the headlamp and at right angles to the H-V axis. The screen shall be sufficiently wide to allow examination and adjustment of the "cut-off" of the passing-beam over at least 5° on either side of the V-V line.

For vertical adjustment: the horizontal part of the "cut-off" is moved upward from below line B and adjusted to its nominal position one per cent (25 cm) below the H-H line.

Figure 1

For horizontal adjustment: the "elbow-shoulder" part of the "cut-off" shall be moved:

(i)Above the line 0.2° D its "shoulder" shall not exceed the line A to the left, and

(ii) On the the line 0.2° D or below its "shoulder" should cross the line A, and

(i)Above the line 0.2° D its "shoulder" shall not exceed the line A to the right, and

(ii) On the the line 0.2° D or below its "shoulder" should cross the line A, and

Where a headlamp so aimed does not meet the requirements set out in Annex 3 its alignment may be changed, provided that the axis of the beam is not displaced:

Horizontally, from line A by more than: 0.5° to the left or 0.75° to the right;

Vertically not more than 0.25° up or down from line B.

To determine the minimum sharpness, measurements shall be performed by vertically scanning through the horizontal part of the "cut-off" in angular steps of 0.05° at either a measurement distance of:

(a)10 m with a detector having a diameter of approximately 10 mm or

(b)25 m with a detector having a diameter of approximately 30 mm.

The measuring distance at which the test was carried out shall be recorded in item 9.8. of the communication form (see Annex 1 to this Regulation).

To determine the maximum sharpness, measurements shall be performed by vertically scanning through the horizontal part of the "cut-off" in angular steps of 0.05° exclusively at a measurement distance of 25 m and with a detector having a diameter of approximately 30 mm.

The "cut-off" quality shall be considered acceptable if the requirements of paragraph 2.1. to  2.3. above comply with at least one set of measurements.

The sharpness factor G is determined by scanning vertically through the horizontal part of the "cut-off" at 2.5° from the V-V where:

G = (log E_β - log E_{(β + 0.1°)}) where β = the vertical position in degrees.

The value of G shall not be less than 0.13 (minimum sharpness) and not greater than 0.40 (maximum sharpness).

The part of the horizontal "cut-off" that serves for vertical adjustment shall be horizontal between 1.5° and 3.5° from the V-V line (see Figure 1 of paragraph 3. below):

(a)The inflection points of the "cut-off" gradient at the vertical lines at 1.5°, 2.5° and 3.5° shall be determined by the equation:

(b)The maximum vertical distance between the inflection points determined shall not exceed 0.2°.

Lighting units when aimed using a method specified by the applicant in accordance with the provisions of the paragraphs 5.2. and 6.2.1.1. of this Regulation: the shape and position of the "cut-off", if any, shall comply with the respective requirements of Table 2 of Annex 3 to this Regulation.

For each further mode of passing-beam, the shape and position of the "cut-off", if any, shall comply automatically with the respective requirements of Table 2 of Annex 3. to this Regulation.

If the "cut-off" complies with the quality requirements of paragraph 2. of this Annex, the beam adjustment may be performed instrumentally.

Figure 1

Moving upward from below the line B (see Figure 2 below), a vertical scan is carried out through the horizontal part of the "cut-off" at 2.5° from V-V. The inflection point (where d² (log E)/dv² =0) is determined and positioned on the line B situated one per cent below H-H.

(a)The "0.2 D line" method (see Figure 2 below).

A single horizontal line at 0.2° D shall be scanned from 5° left to 5° right after the lamp has been aimed vertically. The maximum gradient "G" determined using the formula G = (log Eβ – log E(β + 0.1°)) where β is the horizontal position in degrees, shall not be less than 0.08. 

The inflection point found on the 0.2 D line shall be positioned on the line A

Figure 2

(b) The "3 line" method (see Figure 3 below)

Three vertical lines shall be scanned from 2° D to 2° U at 1°R, 2°R, and 3°R after the lamp has been aimed vertically. The respective maximum gradients "G" determined using the formula:

G=(log E_β - log E_{(β + 0.1°)})

Where β is the vertical position in degrees shall not be less than 0.08. The inflection points found on the three lines shall be used to derive a straight line. The intersection of this line and the line B found while performing vertical aim shall be placed on the V line.

Figure 3