Retailers are well aware that good lighting is critical to visually rendering and calling attention to merchandise, including the role of color rendering. Light is made up of colors. For us to see an object as blue, that color must be present in the object and the light itself.
Most electric white-light sources don’t produce light with a balanced color spectrum, however. They’re manufactured with varying relative intensities of colors. This choice provides control of color appearance of the light source and how objects in the space appear.