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Lighting Research and Technology
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A system of mesopic photometry

Yunjian He, MS

Lighting Research Center, Rensselaer Polytechnic Institute, Troy, NY 12180-3590, USA

Andrew Bierman, MS

Lighting Research Center, Rensselaer Polytechnic Institute, Troy, NY 12180-3590, USA

Mark S Rea, PhD

Lighting Research Center, Rensselaer Polytechnic Institute, Troy, NY 12180-3590, USA

Nearly all the studies to develop mesopic luminous efficiency functions employ brightness matching. Brightness matching elicits parvocellular-channel response, which does not follow Abney's law of additivity as required by photometry. A reaction-time methodology appears to isolate magnocellular-channel response, which seems to be additive. In this study, a set of mesopic luminous efficiency functions were obtained using a novel psychophysical method, which measured reaction time differences between the two eyes. The luminous efficiency functions are well described by a simple model that linearly combines the spectral sensitivities of rods and cones. Based on this model, a preliminary system of mesopic photometry was defined and adapted for practical use.

Lighting Research and Technology, Vol. 30, No. 4, 175-181 (1998)
DOI: 10.1177/096032719803000407
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