ECE R.50 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

This Regulation applies to front position lamps, rear position lamps, stoplamps, direction indicators, and rear-registration-plate illuminating devices for vehicles of category L’.

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.

“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.
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.

Rear position lamp, min.4cd max.12cd

Front position lamp, min.4cd max.60cd
Front position lamps incorporated in the headlamp, min.4cd max.100cd

Stop lamp, min.40cd max.185cd
Direction indicators
Of the category 11 (see Annex 1), min.90cd max.700cd
Of the category 1la (see Annex 1), min.175cd max.700cd
Of the category 11b (see Annex 1), min.250cd max.800cd
Of the category 11c (see Annex 1), min.400cd max.860cd
Of the category 12 (see Annex 1), min.50cd max.350cd
Colour of light emitted

Stop lamps and rear position lamps shall emit red light, front position lampsmay 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.

LISUN following instruments fully meet ECE R.50 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

LSG-1950S Goniophotometer for Traffic Signal Lamps

LSG-1950 Goniophotometer for Automotive and Signal Lamps