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)rnand colour quality (CQ) is presented. The generic name of these new indexes is Efficacy andrnColour Quality (ECQ) and they are designed to classify groups of light sources in a ranking byrnanalysing several of their spectrum features. With this calculation the optimal CQ/LER tradeoffrncan be defined through the value given to a coefficient representing the weight that colourrnquality should have in the ranking established. Using a linear combination between thernGeneral Colour Quality Scale - Qa (Davis, 2010) and the Gamut Volume index (Oc) (Quintero,rnHunt, Carreras, 2012), we obtained an suitable ranking over the 121-spectra databasernstudied. Furthermore, it was demonstrated that the Gamut Volume index Oc has a very similarrnbehaviour to the Gamut Area Scale index - Qg (Davis, 2010), indicating that both indexes arerngood predictors for object colour saturation of a light source.