CIE 208 PDF

CIE 208 – Recommended System for Mesopic Photometry Based on Visual Performance

This report deals with visual task performance based approaches to mesopicphotometry, with a major aim to establish appropriate mesopic spectral sensitivityfunctions to serve as the foundation of a system of mesopic photometry. A review ofthe most important visual tasks and the range of visual conditions typicallyencountered in the context of night-time driving is given.

The existing visual performance based systems for mesopic photometry werereviewed and tested with new independent data sources. The outcome of theanalysis and testing is a recommended system for mesopic photometry based onvisual performance. The report summarises the justifications for the recommendedsystem and gives general guidelines for its use and application.

The publication is written in English, with a short summary in French and German.