In two studies the influence of different headlamp systems on disability and discomfort glare has been quantified. If the legal requirements were fulfilled the visual performance of the drivers was nearly identical for all systems (Xenon, Halogen, reflection systems, projection systems, LED headlamps). Discomfort glare varied slightly if the driver was looking at his own lane. The visual performance decreased dramatically as soon as the legal requirements were not fulfilled. In these situations discomfort glare raised to a high amount. The experiments were done in the light testing facility of the Hella company in Lippstadt (Germany). The test persons found themselves in a typical driving situation: sitting in their car in a driving position and being glared by oncoming traffic in a distance of 50 m. In front of the subjects there was a pair of Halogen headlamps to illuminate their own foreground. On the oncoming lane the glare sources were installed in point B50L. Seven subjects could be tested at a time. The glare sources were: Halogen reflection system, Halogen projection system, Xenon projection system, LED headlamp prototyp I, LED headlamp prototyp II. All headlamps were calibrated in a way that the illuminance at the eyes of the test persons was 0.4 lx (included the foreground illumination). In preliminary tests this has been assessed as a typical value.
Disability and discomfort glare of headlamps
2009
5 Seiten, 5 Bilder, 2 Quellen
Aufsatz (Konferenz)
Englisch
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