ECE R.91 Uniform provisions concerning the approval of side-marker lamps formotor vehicles and their trailers

This Regulation applies to side-marker lamps for vehicles of categories M, N, O and T.
The definitions given in Regulation No. 48 and the series of amendments in force at the time of application for the type of approval shall apply to this Regulation.

“Side-marker lamp” means a lamp used to indicate the presence of the vehicle when viewed from the side.
Intensity of light emitted

The intensity of the light emitted by each of the two samples submitted shall be:

Side-marker lamp category, SM1, SM2

Minimum
intensity, In the axis of reference, SM1 4.0cd , SM2 0.6cd

Within the specified angular field, other than above, SM1 0.6cd, SM2 0.6cd

Maximum

intensity, Within the specified angular field’, SM1 25.0 cd , SM2 25.0cd

Angular field, Horizontal, SM1, ± 45 deg. SM2, ±30deg. Vertical, SM1 ± 10deg. SM2 ± 10 deg.

In addition, for red side-marker lamp, in the angular field from 60 to 90 in horizontal direction and +0 in vertical direction towards the front of the vehicle, the maximum intensity is limited to 0.25 cd.

Colour of light emitted

The colour of the light emitted inside the field of the light distribution grid defined at paragraph 2. of Annex 4 shall be amber. However it can be red, if the rearmost side-marker lamp is grouped or combined or reciprocally incorporated with the rear position lamp, the rear end-outline marker lamp, the rear fog lamp, the stop lamp, or is grouped with or has part of the light emitting surface in common with the rear retro-reflector.

To check these

colorimetric characteristics, the test procedure described in paragraph 9. 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 lamp, in accordance with relevant subparagraphs of paragraph 9.1.of this Regulation.

LISUN following instruments fully meet ECE R.91 Uniform provisions concerning the approval of side-marker lamps formotor vehicles and their trailers

LSG-1950 Goniophotometer for Automotive and Signal Lamps

LSG-1950S Goniophotometer for Traffic Signal Lamps