In the utilitarian and interior lighting of the last decade, light-emitting diodes (LED) are becoming increasingly popular. This is due to the advantages of this light source, which include: high energy efficiency, long service life, ease of light flow control and environmental friendliness. All this allows LED to displace discharge light sources from the market. However, the use of LED in artificial lighting began relatively recently, which determines the need for a better study of the features of the light source and the constant improvement of the regulatory framework. The uniformity of the chromaticity of the radiation is estimated using the color thresholds obtained in the Macadam experiment and called by their shape – Macadam ellipses. This experiment was conducted under the same observation conditions. Their application in practice is limited and requires research in a wide range of observation conditions. In this paper, two models are considered: the CIECAM02 color perception model, which is approved by the ICO (International Commission on Lighting) and the Belyaeva–Matveev model, developed in 1964, at the MPEI. The choice of the second model is due to the fact that it is more accurate in comparison with the generally accepted CIELUV and CIELAB models. A study of the transformation of Macadam ellipses in two models was carried out under changing observation conditions in both brightness and chromaticity and further comparison of the results obtained. The data obtained allow us to speak about the relevance of further studies of the perception of white color radiation in wide ranges of chromaticity and brightness to improve the algorithms of the color perception model.

MacAdam ellipse, color temperature, adaptation luminance, chroma adaptation, CIECAM02, Belyaeva–Matveev model, color appearance model

Budak Vladimir Pavlovich,  ,  orcid.org/0000-0003-4750-0160,  Moscow Power Engineering Institute

Delian Ruzana Ashotovna,  ,  orcid.org/0000-0002-8360-1180,  Moscow Power Engineering Institute