An article from The Melliand introducing the physics of light and color for technical colorists and artists, as the start of a series on lighting for the colorist. It draws analogies between sound and light (pitch/color, loudness/brightness, timbre/wave form), describes the three-resonator theory of color vision in the retina, and explains how spectrophotometers analyze color by wave length and brightness. It closes with color temperature, comparing noon sunlight (about 5000°C) with the Mazda C tungsten lamp and sky conditions, and the need for a standard light for color work.