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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.
| 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 |
| 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 |
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