VS - Lighting Systems - Lighting - 998542

Initial aiming

Initial aiming between -1,0% and -1,5%

7.5. Beam’s downward inclination

Nominal position

Risk of dazzle

In addition to the cut-off line, lights must be set to a certain inclination angle, called the headlight aiming angle. The aiming must be set to the appropriate point to ensure maximum illumination on the road without dazzling other road users. This drawing represents the aiming angle setting for a passenger car, but the principle shown applies equally to vehicles of other categories.

Risk of dangerous dazzle

Above -0,5%

Loaded position

Lack of visibility

Below -2,5%

Lack of visibility

The aiming is defined as follows:

L

Horizon line

h2

-% ê

h1

The inclination is expressed in percentage; it can be calculated by using the formula provided below. It measures light projected above the ground on a screen perpendicular to the vehicle axle at a distance of L=25 m.

Where:

l L is the distance, in millimetres, from the screen to the projector centre of reference.

l h1 is the cut-off line height above the ground, in millimetres, projected on the screen at a distance L. l h2 is the cut-off line height above the ground, taken at the projector centre of reference (eg. to a projection on the screen at a distance L=0).

(h

-h

)

1

2

x100

=

%

L

The inclination is always a negative angle due to the light pointing downwards.

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