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Mesopic visual efficiency IV: a model with relevance to nighttime driving and other applications

National Physical Laboratory, UK, teresa.goodman{at}npl.co.uk

A. Forbes

National Physical Laboratory, UK

H. Walkey

Applied Vision Research Centre, Henry Wellcome Laboratories for Vision Sciences, City University, UK

M. Eloholma

Lighting Laboratory, Helsinki University of Technology, Finland

L. Halonen

Lighting Laboratory, Helsinki University of Technology, Finland

J. Alferdinck

TNO Human Factors, The Netherlands

A. Freiding

Laboratory of Lighting Technology, Darmstadt University of Technology, Germany

P. Bodrogi

Virtual Environment and Imaging Technologies Laboratory, Pannon University, Hungary

G. Várady

Virtual Environment and Imaging Technologies Laboratory, Pannon University, Hungary

A. Szalmas

Virtual Environment and Imaging Technologies Laboratory, Pannon University, Hungary

The authors represent a research consortium¹ which has adopted a task performance based approach for nighttime driving to establish a system for photometry in the mesopic region. This article analyses the experimental investigations described in earlier articles on visual performance in the mesopic domain using reaction time, detection threshold, and discrimination threshold techniques. These results are used to develop a system for mesopic photometry, which balances the quality of the fit to the experimental data with the ease of practical implementation by the lighting industry. A more complex model is also described, which takes account of the chromatic visual response channels and thus provides a better fit to some of the experimental results (particularly those involving monochromatic stimuli), but describes the totality of the data less well and is furthermore less suitable for practical photometric measurements.

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Lighting Research and Technology, Vol. 39, No. 4, 365-392 (2007)
DOI: 10.1177/1477153507080930


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