ECE R.38 UNIFORM PROVISIONS CONCERNING THE APPROVAL OF REAR FOG LAMPSFOR POWER-DRIVEN VEHICLES AND THEIR TRAILERS

“Rear fog lamp”means a lamp used to make the vehicle more easily visible from the rear by giving a red signal of greater intensity than the rear position (side) lamps;

The definitions 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.

“Rear fog lamps of different types” means lamps which differ in such essential respects as:

– the trade name or mark;

– the characteristics of the optical system, (levels of intensity, light distribution angles, category of filament lamp, light sources module, etc.).

INTENSITY OF LIGHT EMITTED

The intensity of the light emitted by each of the two samples shall be not less than the minima and not greater than the maxima specified below and shall be measured in relation to the axis of references in the directions shown below (expressed in degrees of angle with the axis of reference).

The intensity along the H and V axes, between 10 to the left and 10 to the right and between 5 up and 5 down, shall not be less than 150 cd.

The intensity of the light emitted in all directions in which the light(s) can be observed shall not exceed 300 cd per light.

In the case of a single 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 intensities shall not be exceeded.

The apparent surface in the direction of the reference axis shall not exceed 140 cm2.

Annex 3 gives particulars of the measurement method to be used in case of doubt.

TEST PROCEDURE

All measurements shall be carried out with uncoloured standard lamps of the types prescribed for the device, adjusted to produce the normal luminous flux prescribed for those types of lamps.

All measurements on lamps equipped with non-replaceable light sources (filament lamps and other) shall be made at 6.75 V, 13.5 V or 28.0 V respectively.

In the case of light sources supplied by a special power supply, the above test voltages shall be applied to the input terminals of that power supply. The test laboratory may require from the manufacturer the special power supply needed to supply the light sources.

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

LISUN following instruments fully meet ECE R.38 UNIFORM PROVISIONS CONCERNING THE APPROVAL OF REAR FOG LAMPSFOR POWER-DRIVEN VEHICLES AND THEIR TRAILERS

LSG-1950 Goniophotometer for Automotive and Signal Lamps

LSG-1950S Goniophotometer for Traffic Signal Lamps