Automotive exterior lighting systems has several regulatory requirements & most of the manufactures have defined internal standards to achieve desired expectations based on vehicle category. Unavailability of such requirements for interior light illuminating systems has motivated the authors to generate test specifications & measurement methodology. There has been growing interest in automotive vehicle interior lighting for both functional and aesthetic requirements. The purpose of this study is to evaluate the Interior light illuminating devices in terms of “Light harmony”. The lighting harmony is “Maintain the color combination and light intensity level within users comfort zone”. In this study the lighting harmony is measured by means of two methods; one is Subjective evaluation & other is Objective evaluation. The details of these methods are discussed & the available results were analyzed to understand the acceptable limits of light intensity & color combination to achieve expected harmony. Subjective evaluation is the judgmental methodology to identify the harmony. The results give border view to take judgmental decision. Objective evaluation is carried out using CCD based illumination measurement system to get a clearer understanding of luminance and color, which gives the minute details about each aspect of harmony.