Lighting calculations and measurements and validation by 3rd party sources (AGI) All Things Lighting | Relevance in Illumination Engineering : 'via Blog this' CIE 171:2006 – Errata Posted on July 5, 2016 Getting It Right Ian Ashdown, P. Eng., FIES Senior Scientist, Lighting Analysts Inc. [Please send all comments to allthingslighting@gmail.com ] UPDATE 16/07/08 – Added Optis SPEOS to list of validated (not “certified”) software products and Test Case 5.11 analysis. In 2006, the Commission International de l’Eclairage (CIE) published CIE 171:2006, Test Cases to Assess the Accuracy of Lighting Computer Programs . To quote from the summary: The objective of this report is to help lighting program users and developers assess the accuracy of lighting computer programs and to identify their weaknesses. A validation approach is therefore presented based on the concept of separately testing the different aspects of light propagation. To apply this approach, a suite of test c