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We report in this study detailed measurements of optical characteristics of the barrier discharge filled with Ne (50 %) and Xe (50 %) gas compositions. The discharge is driven by a sinusoidal voltage regime and was achieved and studied in the pressure of 250 mbar, at frequency of 40 kHz and for applied voltage going from 800 V up to 2 kV. The input electric power is measured with an oscilloscope, combined with a voltage probe and a current probe. The light intensity for the spectral region from 200 nm to 1100 nm was measured with a optical spectrometer. The lamp spectrum contained 826,877 nm, 822,021 nm, 879,995 nm, 881,999 nm, 902,998 nm and 915,011 nm radiations is studied in order to analysis the chemical kinetics in Ne/Xe mixture flat lamp in DBD emitting in the infrared (IR) and visible band. This study is done to explain the role of excited higher states in production of metastable states of xenon responsible for UV emission. The results discuss the effect of applied voltage and for different gas pressure on the luminance and efficacy of the lamp. The results predict that under the typical operating conditions of the DBD the total efficiency is very high with an optimum pressure at 400 mbar and an optimum voltage of 1200 V. [ABSTRACT FROM AUTHOR]