ECE R.98 UNIFORM PROVISIONS CONCERNING THE APPROVAL OF MOTOR VEHICLE HEADLAMPS EQUIPPED WITH GAS-DISCHARGE LIGHT SOURCES

Headlamps or distributed lighting systems shall be so made that with suitable gas-discharge light source they give adequate illuminance without dazzle when emitting the passing-beam, and good illumination when emitting the driving-beam.

The illumination produced by the headlamp shall be determined by means of a flat vertical screen set up 25 m forward of the headlamp, at right angles to its axes as shown in Annex 3 to this Regulation; the test 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.

Where the gas-discharge light source is approved according to Regulation No. 99 it shall be a standard (étalon) light-source and its luminous flux may differ from the objective luminous flux specified in Regulation No. 99. In this case, the illuminances shall be corrected accordingly.

The above correction does not apply to distributed lighting systems using a non- replaceable gas-discharge light source or to headlamps with the ballast(s) totally or partially integrated.
Where the gas-discharge light source is not approved according to Regulation No. 99 it shall be a production non-replaceable light source.

LISUN following instruments fully meet ECE R.98 UNIFORM PROVISIONS CONCERNING THE APPROVAL OF MOTOR VEHICLE HEADLAMPS EQUIPPED WITH GAS-DISCHARGE LIGHT SOURCES