Recommended system for mesopic photometry based on visual performance

CIE 191:2010 ISBN 978 3 901906 88 6 This report deals with visual task performance based approaches to mesopic photometry, with a major aim to establish appropriate mesopic spectral sensitivity functions to serve as the foundation of a system of mesopic photometry. A review of the most important visual tasks and the range of visual conditions typically encountered in the context of night-time driving is given.