EN Official Journal of the European Union L 97/1

Only the original UN/ECE texts have legal effect under international public law. The status and date of entry into force of this Regulation should be checked in the latest version of the UN/ECE status document Trans/WP.29/343, available at: http://www.unece.org/trans/main/wp29/wp29wgs/wp29gen/wp29fdocstts.html.

Regulation No 50 of the Economic Commission for Europe of the United Nations (UN/ECE) — Uniform provisions concerning the approval of front position lamps, rear position lamps, stop lamps, direction indicators and rear-registration-plate illuminating devices for vehicles of category L

Incorporating all valid text up to:

Supplement 16 to the original version of the Regulation - Date of entry into force: 15 July 2013

CONTENTS

REGULATION

1. Scope

2. Definitions

3. Application for approval

4. Markings

5. Approval

6. General specifications

7. Intensity of light emitted

8. Test procedure

9. Colour of light emitted

10. Conformity of production

11. Penalties for non-conformity of production

12. Production definitely discontinued

13. Names and addresses of Technical Services responsible for conducting approval tests, and of Administrative Departments

14. Transitional provisions

ANNEXES

Annex 1: Minimum horizontal (h) and minimum vertical (v) angles for spatial light distribution

Annex 2: Communication concerning the approval (or refusal or withdrawal of approval or production definitely discontinued) of a type of device pursuant to Regulation No 50

Annex 3: Examples of arrangement of the approval marks

Annex 4: Photometric measurements

Annex 5: Photometric measurements for the rear-registration-plate illuminating device

1. SCOPE

This Regulation applies to front position lamps, rear position lamps, stop lamps, direction indicators, and rear-registration-plate illuminating devices for vehicles of category L (1).

2. DEFINITIONS

2.1. Definitions of terms: The definitions given in Regulations Nos 53 or 74 and the series of amendments in force at the time of application for type approval shall apply to this Regulation.

2.2. "Front position lamps, rear position lamps, stop lamps, direction indicator lamps and rear-registration-plate illuminating devices of different types" means lamps which differ, in each said category, in such essential respects as: (a) The trade name or mark, (b) The characteristics of the optical system, (levels of intensity, light distribution angles, category of light source, light source module, etc.); A change of the colour of the light source or the colour of any filter does not constitute a change of type.

2.3. The definitions of the colour of the light emitted, given in Regulation No 48 and its series of amendments in force at the time of application for type approval shall apply to this Regulation.

2.4. References made in this Regulation to standard (étalon) filament lamp(s) and to Regulation No 37 shall refer to Regulation No 37 and its series of amendments in force at the time of application for type approval. References made in this Regulation to standard (étalon) LED light source(s) and to Regulation No 128 shall refer to Regulation No 128 and its series of amendments in force at the time of application for type approval.

3. APPLICATION FOR APPROVAL

3.1. The application for approval shall be submitted by the holder of the trade name or mark or by his duly accredited representative. It shall specify: 3.1.1. the purpose or purposes for which the device submitted for approval is intended; 3.1.2. in the case of a front position lamp: an indication whether it is intended to emit white or amber light; 3.1.3. in the case of a direction indicator: the category. 3.1.4. At the choice of the applicant, that the device may be installed on the vehicle with different inclinations of the reference axis in respect to the vehicle reference planes and to the ground or rotate around its reference axis or, in the case of a rear registration plate lamp, that the device my be fitted in more than one or a field of positions in relation to the space to be occupied by the registration plate; these different conditions of installation (or different positions) shall be indicated in the communication form.

3.2. For each type of device, the application shall be accompanied by: 3.2.1. drawings, in triplicate, in sufficient detail to permit identification of the type of device and showing in what geometrical positions(s) the device may be mounted on the vehicle; the axis of observation to be taken as the axis of reference in the tests (horizontal angle H = 0°, vertical angle V = 0°) and the point to be taken as the centre of reference in the said tests; the drawing shall show the position intended for the approval mark and eventually the additional symbols in relation to the circle of the approval mark; 3.2.2. a brief technical description stating, in particular, with the exception of lamps with non-replaceable light sources: (a) the category or categories of filament lamp(s) prescribed; this filament lamp category shall be one of those contained in Regulation No 37 and its series of amendments in force at the time of application for type approval; and/or (b) the category or categories of LED light source(s) prescribed; this LED light source category shall be one of those contained in Regulation No 128 and its series of amendments in force at the time of application for type approval; and/or (c) the light source module specific identification code. 3.2.3. Two devices.

4. MARKINGS

4.1. Devices submitted for approval shall in a clearly legible and indelible way bear the following markings: 4.1.1. the trade name or mark of the applicant; 4.1.2. with the exception of lamps with non-replaceable light sources, a clearly legible and indelible marking indicating: (a) the category or categories of light source(s) prescribed; and/or (b) the light source module specific identification code.

4.2. They shall comprise furthermore a space of sufficient size for the approval mark (see paragraph 3.2.1).

4.3. Lamps with non-replaceable light sources or light source module(s) shall bear the marking of rated voltage or the range of voltages, and the rated wattage.

4.4. In the case of light source module(s) the light source module(s) shall bear: 4.4.1. the trade name or mark of the applicant; this marking must be clearly legible and indelible; 4.4.2. the specific identification code of the module; this marking must be clearly legible and indelible. This specific identification code shall comprise the starting letters "MD" for "MODULE" followed by the approval marking without the circle as prescribed in paragraph 5.5.1 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 3.2.1 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. 4.4.3. the marking of the rated voltage and rated wattage.

5. APPROVAL

5.1. If the two devices of a type of device which are submitted in pursuance of paragraph 3 above meet the requirements of this Regulation, approval shall be granted.

5.2. When two or more lamps are part of the same device, approval is only granted, if each of these lamps satisfies the provisions of this Regulation or of another Regulation. Lamps not satisfying any one of those Regulations, shall not be part of such device.

5.3. An approval number shall be assigned to each type approved. Its first two digits (at present 00 for the Regulation in its original form) shall indicate the series of amendments incorporating the most recent major technical amendments to the Regulation at the time of issue of the approval. The same Contracting Party may not assign the same number to another type of device covered by this Regulation.

5.4. Notice of approval or of refusal of approval of a type of device pursuant to this Regulation shall be communicated to the Parties to the Agreement applying this Regulation, by means of a form conforming to the model shown in Annex 2 to this Regulation and of an attached drawing supplied by the applicant for approval, in a format not exceeding A4 (210 × 297 mm) and, if possible, on a scale of 1:1.

5.5. Each device conforming to a type approved under this Regulation shall bear, in the space referred to in paragraph 4.2 above, in addition to the markings referred to in paragraphs 4.1 and 4.3 an international approval mark consisting of: 5.5.1. a circle enclosing the letter "E" followed by the distinguishing number of the country which was granted the approval (2), and 5.5.2. the number of this Regulation, followed by the letter "R", a dash and the approval number; 5.5.3. in the general case of a direction indicator: a number indicating the category 11, 11a, 11b, 11c or 12 close to the circle according to paragraph 5.5.1 and on the opposite side to the approval number; 5.5.4 in the case of a direction indicator, which does on one side not attain the minimum luminous intensity prescribed up to an angle of H = 80° according to paragraph 7.7.1: a horizontal arrow, the tip of which is oriented to the side where the minimum luminous intensity according to paragraph 7.7.1 is complied with up to an angle of at least 80°; 5.5.5. on front or rear position lamps of which the visibility angles are asymmetrical with regard to the reference axis in a horizontal direction, an arrow pointing towards the side on which the photometric specifications are met up to an angle of 80° H.

5.6. Where a device has been found to comply with the requirements of several Regulations, a single approval mark may be applied comprising a circle according to paragraph 5.5.1, the approval numbers and the additional symbols appropriate to each Regulation under which approval has been granted. The size of the components of this single approval mark shall not be less than the minimum size required for the smallest of the individual marks under a Regulation, under which approval has been granted.

5.7. The approval mark referred to in paragraph 5.5 above shall be clearly legible and be indelible. It may be placed on an inner or outer part (transparent or not) of the device emitting the light. In any case the marking shall be visible when the device is fitted on the vehicle or when a movable part such as the seat or a compartment cover is opened.

5.8. Annex 3 gives an example of arrangement of the approval mark.

6. GENERAL SPECIFICATIONS

6.1. Each device shall conform to the specifications of this Regulation.

6.2. The devices must be so designed and constructed that in normal use, and despite the vibrations to which they may be subjected, their satisfactory operation continues to be assured and they retain the characteristics prescribed by this Regulation.

6.3. Position lamps, which are reciprocally incorporated with another function, using a common light source, and designed to operate permanently with an additional system to regulate the intensity of the light emitted, are permitted. 6.3.1. However, in the case of rear position lamp reciprocally incorporated with a stop lamp, the device shall either: (a) Be a part of a multiple light source arrangement, or; (b) Be intended for use in a vehicle equipped with a failure monitoring system for that function. In either case, a note shall be made within the communication document.

6.4. In the case of replaceable light source(s): 6.4.1. Any category or categories of light source(s) approved according to Regulation No 37 and/or Regulation No 128 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 or in Regulation No 128 and its series of amendments in force at the time of application for type approval. 6.4.2. The design of the device shall be such that the light source can not be fixed in any other position but the correct one. 6.4.3. The light source holder shall conform to the characteristics given in IEC Publication 60061. The holder data sheet relevant to the category of light source used, applies.

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 EMITTED

In the reference axis, the intensity of the emitted light of each of the two devices shall be at least equal to the minimum values and not exceed the maximum values of the following table. In no direction, the maximum values indicated shall be exceeded.

min. (cd) max.(cd) 7.1. Rear position lamp 4 12 7.2. Front position lamp 4 60 7.2.1. Front position lamps incorporated in the headlamp 4 100 7.3. Stop lamp 40 185 7.4. Direction indicators 7.4.1. of the category 11 (see Annex 1) 90 700 7.4.1.1. of the category 11a (see Annex 1) 175 700 7.4.1.2. of the category 11b (see Annex 1) 250 800 7.4.1.3. of the category 11c (see Annex 1) 400 860 7.4.2. of the category 12 (see Annex 1) 50 350

7.5. Outside of the reference axis and within the angle fields defined in the diagrams in Annex 1 to this Regulation, the intensity of the light emitted shall, in each direction corresponding to the points in the light distribution table reproduced in Annex 4 to this Regulation, be not less than the product of the minima specified in paragraphs 7.1 to 7.4 above and of the percentage specified in the said table for the direction in question.

7.5.1. In the case of a single lamp containing more than one light source:

(a) the lamp shall comply with the minimum intensity required when any one light source has failed;

(b) when all light sources are illuminated, the maximum intensity for an assembly of two lamps is given by multiplying by 1,4 the value prescribed for a single lamp in paragraphs 7.1 to 7.4;

(c) all light sources which are connected in series are considered to be one light source

7.6. As an exception to paragraph 7.1 above, a luminous intensity of 60 cd maximum shall be permitted for rear position lamps reciprocally incorporated with stop lamps below a plane forming an angle of 5° with and downward from a horizontal plane.

7.7. Moreover,

7.7.1. throughout the fields defined in Annex 1, the intensity of the light emitted shall not be less than 0,05 cd for position lamps and not less than 0,3 cd for stop lamps and direction indicators;

7.7.2. if a position lamp is grouped or reciprocally incorporated with a stop lamp, the ratio between the luminous intensities actually measures of the two lamps when turned on simultaneously and the intensity of the rear position lamp when turned on alone shall be at least 5:1 to the eleven measuring points defined in Annex 4 and situated in the field delimited by straight vertical lines passing through 0°V/± 10°H and the straight horizontal lines passing through ± 5°V/0°H of the light distribution table; If the rear position lamp or the stop lamp or both contain more than one light source and are considered as a single lamp, as defined in paragraph 7.5.2 above, the values to be considered are those obtained with all light sources in operation.

7.7.3. the provisions of paragraph 2.2 of Annex 4 to this Regulation on local variations of intensity shall be observed.

7.8. In general the intensities shall be measured with the light sources(s) continuously alight.

In the case of lamps intended to work intermittently, precaution shall be taken to avoid overheating of the device. Depending on the construction of the device, for example, the use of light-emitting diodes (LED) or the need to take precautions to avoid overheating, it is allowed to measure the lamps in flashing mode.

This must be achieved by switching with a frequency of f = 1,5 ± 0,5 Hz with the pulse width greater than 0,3 s, measured at 95 per cent peak light intensity.

In the case of replaceable filament lamps the filament lamps shall be operated at reference luminous flux during on time. In all other cases the voltage as required in paragraph 8.1 shall be switched with a rise time and fall time shorter than 0,01 s; no overshoot is allowed.

In the case of measurements taken in flashing mode the reported luminous intensity shall be represented by the maximum intensity.

7.9. Annex 4, to which reference is made in paragraph 7.5 above, gives particulars of the methods of measurement to be used.

7.10. The rear-registration-plate illuminating device shall comply with the specifications indicated in Annex 5 to this Regulation.

7.11. Maximum values of front direction indicator lamps

7.11.1. For devices of categories 11 and 11a, the intensity of the the light emitted outside the zone defined by the measuring points ± 10 degrees H and ± 10 degrees V (10 degrees-field) shall not exceed the following values: Direction indicator of category Maximum values in cd outside the 10 degrees-field Single lamp Single lamp containing more than one light source 11 400 560 11a 400 560 Between the boundaries of the 10 degrees-field (± 10 degrees H and ± 10 degrees V) and the 5 degrees-field (± 5 degrees H and ± 5 degrees V), the maximum admissible values of the intensities are linearly increased up to the values as defined in paragraphs 7.4.1 and 7.4.1.1;

7.11.2. For devices of categories 11b and 11c, the intensity of the light emitted outside the zone defined by the measuring points ± 15 degrees H and ± 15 degrees V (15 degrees-field) shall not exceed the following values: Direction indicator of category Maximum values in cd outside the 15 degrees-field Single lamp Single lamp containing more than one light source 11b 250 350 11c 400 560 Between the boundaries of the 15 degrees-field (± 15 degrees H and ± 15 degrees V) and the 5 degrees-field (± 5 degrees H and ± 5 degrees V), the maximum values are increased linearly up to the values as defined in paragraphs 7.4.1.2 and 7.4.1.3.

8. TEST PROCEDURE

8.1. All measurements, photometric and colorimetric shall be carried out with an uncoloured or coloured standard light source of the category prescribed for the device, 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 or 13,5 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. (c) In the case of lamps with non-replaceable light sources: 6,75 V and 13,5 V respectively. (d) In the case of a system that uses an electronic light source control gear being part of the lamp (3) applying at the input terminals of the lamp the voltage declared by the manufacturer or, if not indicated, 6,75 V, 13,5 V or 28,0 V, respectively. (e) In the case of a system that uses an electronic light source control gear not being part of the lamp, the voltage declared by the manufacturer shall be applied to the input terminals of the lamp.

8.2. The test laboratory shall require from the manufacturer the light source control gear needed to supply the light source and the applicable functions.

8.3. The voltage to be applied to the lamp shall be noted in the communication form in Annex 2 of this Regulation.

8.4. The limits of the apparent surface in the direction of the reference axis of a light-signalling device shall be determined.

9. COLOUR OF LIGHT EMITTED

Stop lamps and rear position lamps shall emit red light, front position lamps may emit white or amber light, direction indicators shall emit amber light. For the measurement of the colour of the light emitted inside the field of the light distribution grid defined at paragraph 2 of Annex 4, the test procedure described in paragraph 8. of this Regulation shall be applied. Outside this field no sharp variation of colour shall be observed.

However, for lamps equipped with non-replaceable light sources (filament lamps and other), the colorimetric characteristics should be verified with the light sources present in the lamps, in accordance with relevant subparagraphs of paragraph 8.1 of this Regulation.

10. CONFORMITY OF PRODUCTION

10.1. Every device bearing an approval mark as prescribed under this Regulation shall conform to the type approved and shall comply with the requirements of this Regulation. However, in the case of a device picked at random from series production, the requirements as to the respectively, minimum and maximum intensities of the light emitted (measured with a standard light source as referred to in paragraph 8 above) shall be at least 80 per cent of the minimum values specified and not exceed 120 per cent of the maximum values allowed.

11. PENALTIES FOR NON-CONFORMITY OF PRODUCTION

11.1. The approval granted in respect of a device pursuant to this Regulation may be withdrawn in the foregoing conditions are not observed.

11.2. 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 copy of the approval form bearing at the end, in large letters, the signed and dated annotation "APPROVAL WITHDRAWN".

12. PRODUCTION DEFINITELY DISCONTINUED

If the holder of the approval completely ceases to manufacture a device 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 Parties to the Agreement which apply this Regulation by means of a copy of the approval form bearing at the end, in large letters, the signed and dated annotation "PRODUCTION DISCONTINUED".

13. NAMES AND ADDRESS OF TECHNICAL SERVICES RESPONSIBLE FOR CONDUCTING APPROVAL TESTS, AND OF ADMINISTRATIVE DEPARTMENTS

The Parties to the Agreement which apply this Regulation shall communicate to the United Nations Secretariat the names and addresses of the Technical Services responsible for conducting approval tests and of the Type Approval Authorities which grant approval and to which forms certifying approval or refusal or withdrawal of approval issued in other countries are to be sent.

14. TRANSITIONAL PROVISIONS

14.1. Devices not equipped with filament lamps

14.1.1. As from the date of entry into force of Supplement 4 to this Regulation, no Contracting Party applying this Regulation shall refuse to grant approvals under this Regulation as amended by Supplement 4.

14.1.2. As from 36 months after the date of entry into force of Supplement to this Regulation, Contracting Parties applying this Regulation shall grant approvals only if the type of devices as described in paragraph 14.1 above meets the requirements of this Regulation as amended by Supplement 4.

14.1.3. Contracting Parties applying this Regulation shall not refuse to grant extensions of approvals of this Regulation as amended by Supplement 3.

14.1.4. Contracting Parties applying this Regulation shall continue to grant approvals to those types of devices as described in paragraph 14.1 above, which comply with the requirements of this Regulation amended by Supplement 3 during the 36 months period which follows the date of entry into force of Supplement 4.

14.2. Fitting of devices described in paragraph 14.1 above on a vehicle.

14.2.1. As from the date of entry into force of Supplement 4 to this Regulation, no Contracting Party applying this Regulation shall prohibit the fitting on a vehicle of devices described in paragraph 14.1 above, approved to this Regulation as amended by Supplement 3, during the 48 months period which follows the date of entry into force of Supplement 4.

14.2.2. Contracting Parties applying this Regulation shall continue to allow the fitting on a vehicle of devices described in paragraph 14.1 above, approved to this Regulation as amended by Supplement 3, during the 48 months period which follows the date of entry into force of Supplement 4.

14.2.3. Upon the expiration of a period of 48 months after the date of entry into force of Supplement 4, Contracting Parties applying this Regulation may prohibit the fitting of devices, described in paragraph 14.1 above which do not meet the requirement of this Regulation as amended by Supplement 4, on a new vehicle for which type approval or individual approval was granted more than 24 months after the date of entry into force of Supplement 4.

14.2.4. Upon the expiration of a period of 60 months after the date of entry into force of Supplement 4, Contracting Parties applying this Regulation may prohibit the fitting of devices, as described in paragraph 14.1 above which do not meet the requirements of this Regulation, as amended by Supplement 4, on a new vehicle first registered more than 60 months after the date of entry into force of Supplement 4.

(1) As defined in Annex 7 to the Consolidated Resolution on the Construction of Vehicles (R.E.3), (document TRANS/WP.29/78/Rev.1/Amend.2 as last amended by Amend.4).

(2) The distinguishing numbers of the Contracting Parties to the 1958 Agreement are reproduced in Annex 3 to Consolidated Resolution on the Construction of Vehicles (R.E.3), document TRANS/WP.29/78/Rev.2/Amend.1.

(3) For the purpose of this Regulation "being part of the lamp" means to be physically included in the lamp body or to be external, separated or not, but supplied by the lamp manufacturer as part of the lamp system. The functioning and installation conditions of these additional systems will be defined by special provisions.

ANNEX 1 MINIMUM HORIZONTAL (H) AND MINIMUM VERTICAL (V) ANGLES FOR SPATIAL LIGHT DISTRIBUTION 1. FRONT POSITION LAMPS V = + 15°/– 10° Front position lamps (for a pair of lamps) V = + 15°/– 10° 2. REAR POSITION LAMPS V = + 15°/– 10° Rear position lamps (for a pair of lamps) V = + 15°/– 10° 3. DIRECTION INDICATORS OF CATEGORIES 11, 11a, 11b, 11c AND 12 V = ± 15° Minimum horizontal angles of light distribution in space: Categories 11, 11a, 11b and 11c : direction indicators for the front of the vehicle; Category 11 : for use at a distance not less than 75 mm from the passing beam headlamp; Category 11a : for use at a distance not less than 40 mm from the passing beam headlamp; Category 11b : for use at a distance not less than 20 mm from the passing beam headlamp; Category 11c : for use at a distance less than 20 mm from the passing beam headlamp. 4. STOP LAMPS V = + 15°/– 10°

ANNEX 2 COMMUNICATION (Maximum format: A4 (210 × 297 mm))

ANNEX 3 EXAMPLES OF ARRANGEMENTS OF THE APPROVAL MARKS (see paragraph 5.3 of this Regulation) a ≥ 5 mm A device bearing the approval mark shown above is a direction indicator of the category 11 approved in the Netherlands (E4) under the number 00243. The first two digits of the approval number indicate that the approval was granted in accordance with the requirements of Regulation No 50 in its original form. For a direction indicator, the arrow indicates that the luminous distribution is asymmetrical in a horizontal plane and that the photometric values required are satisfied up to an angle of 80° to the right, the device seen in the opposite sense of the light emitted. Light source modules The light source module bearing the identification code shown above has been approved together with a lamp approved in Italy (E3) under approval number 17325. Note: The approval number must be placed close to the circle and either above or below the letter "E" or to the left of right of that letter the digits of the approval number must be on the same side of the "E" and face in the same direction. The use of Roman numbers as approval numbers should be avoided so as to prevent any confusion with other symbols.

ANNEX 4 PHOTOMETRIC MEASUREMENTS 1. MEASUREMENT METHODS 1.1. During photometric measurements, stray reflections shall be prevented by appropriate masking. 1.2. Should the results of measurements be challenged, measurements shall be carried out in such a way as to meet the following requirements: 1.2.1. the distance of measurements shall be such that the law of the inverse of the square of the distance is applicable; 1.2.2. the measuring equipment shall be such that the angular aperture of the receiver viewed from the reference centre of the lamp is between 10' and 1°; 1.2.3. the intensity requirement for a particular direction of observation shall be deemed to be satisfied if that requirement is met in a direction deviating by not more than 15' from the direction of observation. 1.3. In the case where the device may be installed on the vehicle in more than one or in a field of different positions the photometric measurements shall be repeated for each position or for the extreme positions in the field of the reference axis specified by the manufacturer. 2. STANDARD LUMINOUS INTENSITY DISTRIBUTION TABLE 2.1. The direction H = 0° and V = 0° corresponds to the reference axis. (On the vehicle it is horizontal, parallel to the median longitudinal plane of the vehicle and oriented in the required direction of visibility). It passes through the centre 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, schematically shown as a grid, the light pattern should be substantially uniform so that 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 on the grid lines surrounding the questioned direction. 3. TEST CONDITIONS The photometric performance shall be checked: 3.1. For non-replaceable light sources (filament lamps and others): 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 or 13,5 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 or 13,5 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 or 13,5 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 lamps, 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; direction indicators shall be operated in the flashing mode (f = 1,5 Hz, duty factor 50 per cent). 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.