Enhanced Night Visibility Series, Volume XVII: Phases II and III—Characterization of Experimental Vision Enhancement Systems
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CHAPTER 5—HEADLAMP CHARACTERIZATION
In ENV Volume XV, Influence of Beam Characteristics on Discomfort and Disability Glare, the beam patterns of various headlamps were objectively classified for use as an independent variable. Accordingly, a method for comparatively determining the beam patterns was created. Headlamps were classified as low, medium, or high in relative intensity of the beam and as wide, medium, or narrow in the relative width of the beam. A comparison across all data from available designs was made by determining the width at the intensity level of 12,000 cd. This level was used because it was the closest region approximate to half of the maximum intensity (i.e., 50 percent beam angle) for the lowest available value obtained (25,978 cd) from all of the headlamp designs. Table 25 shows the beam characterizations of various headlamp designs and their extremes and norms. Table 26 shows the headlamps and their corresponding beam characteristics selected for use in ENV Volume XV.
Table 25. Headlamp characterization data.
Headlamp |
Beam
Width |
Dist F
@ 1.5
Lux |
20 m / −3
Left |
Hotspot Max |
Left
2,000 |
Right
2,000 |
Width
2,000 |
Up
2,000 |
Down
2,000 |
Height
2,000 |
Left
12,000 |
Right
12,000 |
Width
12,000 |
Up
12,000 |
Down
12,000 |
Height
12,000 |
HID |
Narrow |
19.5 |
0.65Lux |
34449 0.8D/2.6R |
−23.5 |
23.5 |
47.0 |
0.5 |
−9.0 |
9.5 |
−3.0 |
6.0 |
9.0 |
0.5 |
−2.5 |
3.00 |
HLB* |
Narrow |
no data |
no data |
30139.84 2.0D/0R |
−17.5 |
17.5 |
35.0 |
0.0 |
−7.5 |
7.5 |
−4.0 |
5.5 |
9.5 |
0.0 |
−3.25 |
3.25 |
HID/HID 4* |
Narrow |
20.5 |
0.45Lux |
40778 1.0D/1.6R |
−29.5 |
30.0 |
59.5 |
0.5 |
−8.0 |
8.5 |
−3.5 |
6.0 |
9.5 |
0.0 |
−2.5 |
2.50 |
HID |
Narrow |
19.0 |
0.55Lux |
26984 0.8D/1.8R |
−33.0 |
40.0 |
73.0 |
0.5 |
−7.0 |
7.5 |
−5.5 |
6.5 |
12.0 |
0.0 |
−2.0 |
2.00 |
HID |
Narrow |
23.5 |
0.65Lux |
30666 1.4D/1.8R |
−31.5 |
23.5 |
55.0 |
−0.5 |
−8.0 |
7.5 |
−7.0 |
7.0 |
14.0 |
0.0 |
−3.0 |
3.00 |
HID |
Narrow |
23.0 |
0.85Lux |
32882 1.6D/1.8R |
−22.0 |
26.5 |
48.5 |
0.0 |
−10.0 |
10.0 |
−5.5 |
9.5 |
15.0 |
−0.5 |
−3.5 |
3.00 |
HID |
Narrow |
19.5 |
0.90Lux |
27145 0.6D/2.0R |
−23.5 |
27.0 |
50.5 |
0.0 |
−7.0 |
7.0 |
−7.0 |
9.0 |
16.0 |
0.0 |
−4.0 |
4.00 |
HID |
Narrow |
22.0 |
0.55Lux |
38795 1.8D/2.0R |
−27.0 |
27.0 |
54.0 |
0.0 |
−7.0 |
7.0 |
−9.0 |
8.0 |
17.0 |
−1.0 |
−4.0 |
3.00 |
HID |
Medium |
21.5 |
0.75Lux |
30753 1.2D/1.8R |
−23.0 |
23.0 |
46.0 |
0.5 |
−8.0 |
8.5 |
−7.5 |
10.5 |
18.0 |
0.0 |
−2.5 |
2.50 |
HID |
Medium |
24.0 |
0.85Lux |
39953 0.8D/2.0R |
−22.5 |
31.0 |
53.5 |
0.0 |
−9.0 |
9.0 |
−8.0 |
11.5 |
19.5 |
0.5 |
−2.5 |
3.00 |
HID |
Medium |
26.0 |
0.75Lux |
41431 1.4D/2.8R |
−26.0 |
21.5 |
47.5 |
1.0 |
−7.0 |
8.0 |
−8.5 |
11.0 |
19.5 |
0.0 |
−2.5 |
2.50 |
HID |
Medium |
25.0 |
0.95Lux |
41830 1.0D/2.2R |
−29.5 |
33.5 |
63.0 |
0.0 |
−9.0 |
9.0 |
−5.0 |
14.5 |
19.5 |
0.5 |
−2.0 |
2.50 |
HID |
Medium |
21.5 |
0.75Lux |
28120 0.8D/3.6R |
−26.5 |
27.0 |
53.5 |
0.5 |
−8.5 |
9.0 |
−8.0 |
12.0 |
20.0 |
1.0 |
−2.0 |
3.00 |
HID 3* |
Medium |
21.5 |
0.65Lux |
35771 0.8D/2.2R |
−17.0 |
25.0 |
42.0 |
1.0 |
−6.5 |
7.5 |
−9.0 |
11.0 |
20.0 |
0.5 |
−3.0 |
3.50 |
HID |
Medium |
22.0 |
0.85Lux |
28864 1.0D/1.8R |
−31.0 |
33.5 |
64.5 |
1.5 |
−7.5 |
9.0 |
−9.0 |
11.5 |
20.5 |
−0.5 |
−4.0 |
3.50 |
HID |
Medium |
24.0 |
0.75Lux |
35916 1.8D/2.2R |
−25.0 |
26.5 |
51.5 |
−0.5 |
−13.0 |
12.5 |
−9.5 |
11.0 |
20.5 |
−1.0 |
−6.0 |
5.00 |
HID |
Medium |
22.0 |
0.95Lux |
43430 0.8D/2.4R |
−26.0 |
31.0 |
57.0 |
0.5 |
−8.0 |
8.5 |
−11.0 |
12.5 |
23.5 |
−0.5 |
−2.5 |
2.00 |
HID |
Wide |
26.0 |
0.95Lux |
45034 1.0D/2.4R |
−27.0 |
35.0 |
62.0 |
1.0 |
−10.0 |
11.0 |
−9.5 |
14.0 |
23.5 |
0.0 |
−3.5 |
3.50 |
HID |
Wide |
22.5 |
0.95Lux |
27127 1.4D/2.0R |
−29.0 |
27.0 |
56.0 |
0.0 |
−7.5 |
7.5 |
−13.0 |
11.0 |
24.0 |
0.0 |
−4.5 |
4.50 |
HID |
Wide |
24.0 |
1.00Lux |
36847 1.2/3.0R |
−23.0 |
23.0 |
46.0 |
0.0 |
−7.5 |
7.5 |
−11.0 |
13.0 |
24.0 |
0.0 |
−3.0 |
3.00 |
HID |
Wide |
25.0 |
0.75Lux |
41562 1.2D/2.0R |
−22.5 |
25.5 |
48.0 |
0.0 |
−7.5 |
7.5 |
−11.0 |
13.0 |
24.0 |
−0.5 |
−3.0 |
2.50 |
HID |
Wide |
24.0 |
0.85Lux |
36061 1.6D/2.2R |
−22.5 |
23.0 |
45.5 |
−0.5 |
−8.0 |
7.5 |
−11.0 |
13.5 |
24.5 |
0.0 |
−2.5 |
2.50 |
HID |
Wide |
24.5 |
1.00Lux |
40472 0.8D/0.2R |
−28.5 |
27.0 |
55.5 |
0.0 |
−15.0 |
15.0 |
−12.0 |
12.5 |
24.5 |
0.0 |
−4.0 |
4.00 |
HID 1* |
Wide |
20.0 |
0.95Lux |
28772 0.2D/2.0R |
−23.0 |
25.0 |
48.0 |
2.0 |
−5.5 |
7.5 |
−10.5 |
14.5 |
25.0 |
1.5 |
−2.5 |
4.00 |
HID |
Wide |
21.5 |
0.95Lux |
25978 0.8D/3.2R |
−35.5 |
42.0 |
77.5 |
1.5 |
−10.0 |
11.5 |
−12.5 |
13.5 |
26.0 |
0.0 |
−3.0 |
3.00 |
HID 2* |
Wide |
23.5 |
0.75Lux |
43181 2.2D/.4R |
−23.0 |
26.5 |
49.5 |
0.5 |
−7.0 |
7.5 |
−13.0 |
13.5 |
26.5 |
0.0 |
−2.5 |
2.50 |
Table 26. Headlamp characterization matrix.
|
Narrow Beam Width |
Medium Beam Width |
Wide
Beam Width |
High Beam
Intensity |
HID 1 |
|
HID 2 |
Medium Beam Intensity |
|
HID 3 |
|
Low Beam
Intensity |
HLB |
|
HID/HID 4 |
|