A user interface for controlling a multichannel lighting unit wherein each channel (B, G, R, FR) of the multichannel lighting unit comprises at least one light source for emitting light having a channel-specific spectral composition (CH1:B, CH2:W, CH3:R, CH4,FR), the spectral composition associated with one channel being different from the spectral composition associated with another channel, a light output from each channel being individually controllable, the user interface comprising: - at least two user interaction elements , each user interaction element associated with a color producible with the multichannel lighting unit, wherein the color associated with at least one of the at least two user interaction elements does not have a directly corresponding channel in the multichannel lighting unit, each user interaction element comprising: - a static scale representing a static range of control values for controlling a light output of the multichannel lighting unit in respect of the color associated with the user interaction element, wherein the range of control values in the static scale is determined by a minimum and maximum light output, in the associated color, of the multichannel lighting unit, - a dynamic scale representing a dynamic range of control values for controlling a light output of the multichannel lighting unit in respect of the color associated with the user interaction element, - a selector adjustable by a user of the user interface for selecting a present control value for controlling the light output of the multichannel lighting unit in respect of the color associated with the user interaction element, characterized in that the dynamic range of control values is a valid/executable range determined at least in part based on a present control value selected in respect of another user interaction element, and the dynamic scale is depicted as a subrange of the static scale and overlaying said static scale. - at least two user interaction elements , each user interaction element associated with a color producible with the multichannel lighting unit, wherein the color associated with at least one of the at least two user interaction elements does not have a directly corresponding channel in the multichannel lighting unit, each user interaction element comprising: - a static scale representing a static range of control values for controlling a light output of the multichannel lighting unit in respect of the color associated with the user interaction element, wherein the range of control values in the static scale is determined by a minimum and maximum light output, in the associated color, of the multichannel lighting unit, - a dynamic scale representing a dynamic range of control values for controlling a light output of the multichannel lighting unit in respect of the color associated with the user interaction element, - a selector adjustable by a user of the user interface for selecting a present control value for controlling the light output of the multichannel lighting unit in respect of the color associated with the user interaction element, the dynamic range of control values is a valid/executable range determined at least in part based on a present control value selected in respect of another user interaction element, and the dynamic scale is depicted as a subrange of the static scale and overlaying said static scale. <EOS>