When it comes to colour control, vastly varying constellations are possible. Colour mixing is often based on one of the following three principles:
RGB: the composition of the resulting colour is achieved using three light sources with the base colours red, green and blue.
RGBW: like RGB, only with an added white light source. Often used where luminaires, e.g. at different times of day, are used for decorative as well as functional lighting.
White-white (tunable white): control of white light colour temperature. Usually utilised to imitate the colour temperature progression of daylight (see also chapter “Human Centric Lighting”).