METHOD TO ESTABLISH A COLOUR QUALITY AND LUMINOUS EFFICACY RANKING FOR LIGHT SOURCES

摘要

A method for calculating two indexes that involves both luminous efficacy of radiation (LER) and colour quality (CQ) is presented. The generic name of these new indexes is Efficacy and Colour Quality (ECQ) and they are designed to classify groups of light sources in a ranking by analysing several of their spectrum features. With this calculation the optimal CQ/LER tradeoff can be defined through the value given to a coefficient representing the weight that colour quality should have in the ranking established. Using a linear combination between the General Colour Quality Scale - Qa (Davis, 2010) and the Gamut Volume index (Oc) (Quintero, Hunt, Carreras, 2012), we obtained an suitable ranking over the 121-spectra database studied. Furthermore, it was demonstrated that the Gamut Volume index Oc has a very similar behaviour to the Gamut Area Scale index - Qg (Davis, 2010), indicating that both indexes are good predictors for object colour saturation of a light source.