We at NEC provide a variety of lamps for use in peoples' daily lives. Each type of lamp has its own particular characteristics. We have prepared the graph below to serve as an aid in the selection of the ideal lamp for a particular purpose or application. This graph plots the color temperature of each type of lamp versus its average color rendering index (Ra). The horizontal axis of the graph indicates the average color rendering index of each lamp, the characteristic which affects the way in which the color of objects illuminated by the lamp are perceived.
The more right value indicated the better the color rendering, and the closer the color rendering approaches that of a standard light source of the same color temperature. The vertical axis indicates the color temperature of the light radiated by each lamp. The higher the value appears on the graph, the higher the color temperature becomes. The perceived color characteristics are also noted for the various color temperatures indicated.