Investigation of the visible range of different types of headlamps.

Author(s)
Volker, S. & Kleinkes, M.
Year
Abstract

Factors affecting the dependence of the visible range of headlamps of different beam patterns are considered. Projection and reflection systems fitted with halogen bulbs were investigated in a light testing facility. Subjective impressions of visible range depended on the beam pattern and the level of illuminance. Vertical illuminance as a criterion for recognisability distance was investigated. The deviations of one third of all beam patterns examined indicated that the 2 lx line cannot be regarded as the generally valid threshold of recognition. Contrast as a criterion for visible range is discussed. Average edge contrast is considered a safe threshold criterion for the determination of visible range even for different beam patterns. For the covering abstract see ITRD E123380.

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Publication

Library number
C 31242 (In: C 31161 b [electronic version only]) /71 /91 /83 / IRRD E123461
Source

In: Proceedings of PAL® 2001 - Progress in Automobile Lighting, held at Darmstadt University of Technology, Laboratory of Lighting Technology, September 25-26 2001, Darmstädter Lichttechnik Volume 9, p. 1009-1017

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