Light & Engineering Vol. 23, No. 4, pp. 63-69, 2015 Svetotekhnika No. 6, 2015, pp. 33-35 EVALUATING THE UNCERTAINTY OF THE SPECTRORADIOMETRIC APPROACH FOR THE CALCULATION OF SSL LUMINAIRES CHROMATICITY COORDINATES Alexander A. Sharakshane, Anton S. Sharakshane, and Raisa I. Stolyarevskaya LLC “Editorial of Svetotekhnika Journal”, Moscow E-mail: lights-nr@inbox.ru ABSTRACT The accuracy of chromaticity coordinates measurements, which are effective values, connected with the CIE tabulated functions and with a specific colour space, depends on the measuring devices used and on the spectral distribution of the energy characteristics of the radiators. <...> In this paper, limit evaluations of colour coordinates х and у determination error are considered for lighting devices with light emitting diodes under laboratory test conditions. <...> The evaluations are based on measurements of irradiance spectral distribution created by an LED luminaire, taking into account the uncertainty of the spectral characteristics of a standard source, which is used for spectrometer calibration. <...> The research was performed by analysing linear errors and using the stochastic simulation method. <...> Keywords: chromaticity coordinates, colour stimuli (coordinates), irradiance spectral distribution, standard lamp, colour space, chromatic locus, limit evaluations of chromaticity coordinate uncertainty, random errors, stochastic simulation, error correlation 1. <...> INTRODUCTION When analysing the methods and measuring devices in the fi elds of photometry and colorimetry, which are the most important and expansive directions of lighting science connected with the visual perception of optical radiation by a person (CIE tab63 ulated functions), the differences and benefi ts of various approaches should be clearly understood. <...> One of the main benefi ts is the resulting uncertainty of the measurement results. <...> Light and chromatic measurements can be achieved using the following methods: – A comparison of the measured radiation source with a standard lamp of light or chromatic values by means of an integral comparator; – A direct measurement of light and chromatic characteristics using a photometric head, a photometer, a luxmeter or a colorimetric head as well as a colorimeter; – A measurement of the spectral distribution characteristics of the radiator and calculation of the photometric and colorimetric values. <...> In the latter case, the CIE tabulated addition functions don’t contribute any error. <...> In event of direct measurements based on the detector approach <...>