Chapter 4 summarizes lighting. Light is what makes things visible. All colors depend on light. The types are lighting that exist are natural daylight, artificial, incandescent, fluorescent, or high-intensity lighting. Visible light is actually composed of the whole spectrum of colors, from red to violet. Ultraviolet light, x-rays, and gamma rays have short wavelengths the the human eye can see. The color of an object is seen as a result of the objects selective intake of light rays. General or primary lighting is allover the level of illumination in an area. It is the light that fills the selling floor from overhead light fixtures. The display person should be especially concerned with the mixing of light because it greatly affects the consumer. Shoppers respond to light. Light makes the colors of a shop come alive and creates the overall ambience.