All other wavelengths are absorbed. Regardless of the characteristics of the surface finish, the eye can see only the colors of a surface that are present in the source of illumination. Subtle changes in the color of light can influence a person's subconscious judgment of the general environment. Perception of surface tones and colors also affects the sense of warmth or coolness associated with a space. A warm atmosphere is associated with hues of yellow, through orange and red, to red-purple.
All objects emit light if they are heated to a sufficiently high temperature.
As an object's temperature rises, the color of the light emitted from it will change. In the same way, a tungsten filament in an incandescent lamp changes color when different voltages are applied. Such a radiator is black at room temperature, red at 800K, yellow at 3000K, white at 5000K, pale blue at 8000K, and brilliant blue at 60,000K. Incandescent lamps used for general lighting have color temperatures in the 2600K to 3000K range. Unfortunately, the apparent color temperature for a light source provides no information about its spectral energy distribution. For example, cool white and deluxe cool white lamps have the same apparent color temperature, yet their spectral distribution curves and their effects on colored objects and materials are quite different.