The invention relates to a control device (1) for controlling hue (H) and saturation (S) of light (L) emitted by a light source (2). The device comprises a body (20) with a surface (21) containing a visible representation (10,11,12,13) of a plurality of selectable combinations of hue and saturation available for said light source. The device further has means (26) for generating at least one selection signal in response to a selection of a combination of hue and saturation on said surface, said selection signal comprising said selected hue and saturation, and means (27) for communicating said selection signal to said light source to control said hue and saturation of said light in accordance with said selected combination of hue and saturation. The control device (1) is simple and user intuitive.