With the further development of automotive lamps and headlamps, the subject of glare will continue to be one of major importance for all road users in the years to come. Due to the use of gas discharge lamps, the relevant headlamp systems have significantly higher luminances than comparable halogen systems. In addition, headlamp light apertures have become smaller and smaller in the past few years on account of design requirements. For this reason, a higher luminance and a different light colour have done nothing to lessen the discussion about glare since the introduction of gas discharge lamps. In the literature, a distinction is made between the physical cause of glare which is produced by stray light, and the physiological cause, which is based on the change in sensitivity of the retina. Due to the tiny glance fluctuations of the eye, the image of the headlamp is not restricted to only a few local receptors, but rather non- illuminated receptors are continually adapting to brightness. We use the term glare to describe the situation where the eye is no longer able to compensate the extreme differences in luminance in the visual field. The upper limit for the cones is given in the literature as 105 cd/m(exp2). When the existing models for calculating glare in automotive lighting are considered, it must be established that the phenomenon of stray light plays a much more significant role than changes in sensitivity of the retina. This is not least due to the fact that the measuring equipment available to date has not allowed such approaches to be considered or tested empirically. This article describes a further step towards the objective evaluation of automotive headlamp glare. Alongside the classical method of determining the illuminance at the eye, various luminance measurements will be presented. Details will be given both of special features during measurement and the opportunities and limitations of these measuring techniques for glare evaluation.
Headlamp glare evaluation
Bewertung der Blendung durch Scheinwerfer
2003
15 Seiten, 7 Bilder, 1 Tabelle, 5 Quellen
Aufsatz (Konferenz)
Englisch
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