Warm colours of light are preferred above all at lower illuminances and with directed light, whereas cold colours of light are accepted at high illuminances and diffuse illumination. White light is described by specifying the colour temperature, colour rendition, chromaticity location and spectrum. The white colour temperature is divided into three main groups: warm white, neutral white and daylight white. A good colour rendition with the lighting will only produce a low colour deviation. The chromaticity location identifies the colour within the CIE diagram.