VS - Lighting Systems - Lighting - 998542

8. Beams photometric characteristics

From 2015, the photometric charts are defined based on the intensity @ 25 m (cd) 1 Lux @ 25 m = 625 cd

8.3. Photometric charts In order to simplify control lighting systems specification, photometric charts have been standardized for each type of light source and have been updated according to systems evolution and complexity. Photometric charts are a 2D representation of light projection at 25 m on a flat vertical screen. This flat image reflects the real illumination on the road.

The illumination mapping is defined via vertical and horizontal coordinates on a grid.

l Photometric points positioning is defined in terms of angular position.

l Vehicles in Europe used to use the illuminance (in Lux) to characterized lighting systems. From 2015, the European commission harmonizes with US standards and defines the intensity (in candela) as the new unit for beams measuring. Nevertheless both illuminance and intensity units are linked and illuminance can still be used prior to the switch date.

l European regulation stipulates measurements at 25 m from the light source @ 13.2 V battery voltage.

Low beam photometric charts for Halogen headlamps (ECE R112)

V

1

2

3

Halogen Type l min Halogen type l min. (cd) l max. (cd) l max 350 cd -

B50L

Zone III

75R 75L 50R 50L 50V 25L 25R B 0L 75R 75L 50R 50 50V

-

350

6

10100 cd

-

4

5

-

10600 cd

10100

-

BR

10100 cd

-

-

10600

7

8

13200 cd

H

H

75R

75L

10100

-

5100 cd 1700 cd 1700 cd 190 cd 190 cd 190 cd 375 cd 375 cd 375 cd

- - - - - - - - - - - -

Zone II Z

-

13200

Zone IV V

50L

50

50R

25R

25L

5100 1700 1700

-

P1 P2 P3 P4 P5 P6 P7 P8 25L 25R P1 P2 P3 P4 P5 P6 P7 P8

Zone I

- - - - - - - - -

190 190 190 375 375 375

V

Zone III < 625cd Zone III < 625 cd Zone IV > 2500 cd Zone I < 50R or 50L Zone IV > 2500cd Zone IV > 2500cd Zone I < 50R or 50L

1 deg

65 cd

125 cd

1 deg deg

65

Zone II is delimited by line h-h, Zone I, Zone IV and vertical lines at 9 deg L and 9 deg R Zone II is delimited by line h-h, Zone I, Zone IV and vertical lines at 9 deg L and 9 deg R.

125

30