LED was still a magic word 15 years ago and the light of the future. Today it is the light of the presence. In addition to cold and warm white light, LED technology has also brought coloured light into everyday life as well as new forms of interacting with lights. Already at the beginning of this light revolution the question arose how to deal with this creative potential of coloured light in connection with coloured surfaces, time, space and perception. Selected works from research and teaching projects of the Colour-Light-Center from the beginnings of LED technology to the present will be presented.