Perceived colour fidelity under LEDs with similar Rf but different Ra

M. Wei, M. Royer, H. P. Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

7 Citations (Scopus)


Substantial efforts have been made to develop new colour fidelity measures that are better correlated to perceived colour fidelity. Such measures minimize the possibility of increasing rated colour fidelity through spectral optimization without improving perceived colour fidelity. This paper reports a psychophysical experiment that was carefully designed to investigate how light sources with different spectral features affected perceived colour fidelity, and whether the effect can be reflected by the two existing colour fidelity measures (CIE Ra and Illuminating Engineering Society (IES) Rf). Fourteen observers evaluated the colour differences of eight physical colour samples under three pairs of light sources, which had similar IES Rf but different Ra values. IES Rf was found to perform better than CIE Ra.

Original languageEnglish
Pages (from-to)858-869
Number of pages12
JournalLighting Research and Technology
Issue number6
Publication statusPublished - 1 Oct 2019

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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