Installation Limits and Usage of H-Plane for Tail and Rear Position Lamps

1. SLR-62-09 Installation limits Usage of the H-plane 2108 2100 2100 2100 open UN-R / GB / TAI/IND DOT 1829 1829 open 1829 1500 mm 1500 Off- road 1200 mm 1200 grou- ped 1000 mm 800 mm 381 381 381 381 350 mm 250 mm open open 0 mm Reversing DI Stop S1/S2 Front position Rear position Rear fog front/rear Footnotes 1

2. Installation limits Usage of the H-plane – Example tail lamp / rear position lamp 5.8. The maximum height above the ground shall be measured from the highest point and the minimum height from the lowest point of the apparent surface in the direction of the reference axis. Where the (maximum and minimum) height above the ground clearly meets the requirements of the Regulation, the exact edges of any surface need not be determined. For the purposes of reducing the geometric visibility angles, the position of a lamp with regard to height above the ground, shall be measured from the H plane. (Rear position lamp) In height: above the ground, not less than 350 mm nor more than 1,500 mm (2,100 mm if the shape of the bodywork makes it impossible to keep within 1,500 mm and if the optional lamps are not installed). … 5.8.1. 6.10.4.2. S6.1.4 Mounting height. The mounting height of each lamp and reflective device must be measured from the center of the item1, as mounted on the vehicle at curb weight, to the road surface. 1„center of the lamp is seen as the center of the light source (for simple layouts)^^ or as center of reference when using more complicated shapes and light source designs Footnotes 2

3. Installation limits Usage of the H-plane – Comparison tail lamp UN-R / GB / TAI/IND DOT 2100 1829 mm 1829 Low mounted Low mounted 1500 mm 1500 750 mm 381 350 350 mm 0 mm Footnotes 3

4. Installation limits Usage of the H-plane – possible achievement and harmonization 2100 1829 mm 1500 mm 1500 Additional positions and designs when referencing the H-plane without changing the mounting limits! 750 mm 350 350 mm 0 mm Footnotes 4

5. Installation limits Usage of the H-plane Notes: 2.10.5. “Axis of reference" (or "reference axis") means the characteristic axis of the lamp determined by the manufacturer (of the lamp) for use as the direction of reference (H = 0°, V = 0°) for angles of field for photometric measurements and for installing the lamp on the vehicle. 2.10.10. 5.8. "H plane" means the horizontal plane containing the centre of reference of the lamp. The maximum height above the ground shall be measured from the highest point and the minimum height from the lowest point of the apparent surface in the direction of the reference axis. Where the (maximum and minimum) height above the ground clearly meets the requirements of the Regulation, the exact edges of any surface need not be determined. For the purposes of reducing the geometric visibility angles, the position of a lamp with regard to height above the ground, shall be measured from the H plane. 5.8.1. Why use two different reference locations for mounting limit evaluation? Footnotes 5