Dynamic user interface

1. A user interface for controlling a multichannel lighting unit wherein each channel of the multichannel lighting unit comprises at least one light source for emitting light having a channel-specific spectral composition, 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, wherein 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 wherein the dynamic scale is depicted as a subrange of the static scale and overlaying said static scale,

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.

2. The user interface of claim 1 wherein the dynamic range of a first of the at least two user interaction elements is automatically adapted when the present control value for a second of the at least two user interaction elements is changed using the selector of the second of the at least two user interaction elements.

3. The user interface claim 1 wherein the dynamic range of the first of the at least two user interaction elements is a subrange of the static range of the first of the at least two user interaction elements.

4. The user interface of claim 3 , wherein the dynamic range excludes the end points of the static range, especially wherein a minimum control value of the dynamic range of a user interaction element is larger than a minimum control value of the static range for the user interaction element.

5. The user interface according to claim 1 wherein the selector overlays the dynamic scale, which itself overlays the static scale.

6. The user interface according to claim 1 wherein each user interaction element further comprises a feedback indicator for indicating the present control value for controlling the light output of the multichannel lighting unit in respect of the color associated with the user interaction element.

7. The user interface according to claim 1 wherein the colors associated with the at least two user interaction elements comprise one of blue, green, white, deep-red and far-red.

8. The user interface according to claim 1 wherein the control values in the static range and/or the dynamic range are expressed as a percentage or an absolute value.

9. The user interface according to claim 8 wherein the control values are expressed in μmol·s −1 or μmol·s −1 ·m −2 of photon in the wavelength range of the corresponding color.

10. The user interface according to claim 1 , wherein the user interface is implemented as an application adapted to run on a central control system of a greenhouse or vertical farm.

11. A lighting system comprising:

a multichannel lighting unit wherein each channel of the multichannel lighting unit comprises at least one light source for emitting light having a channel-specific spectral composition, the spectral composition associated with one channel being different from the spectral composition associated with another channel, and a light output from each channel being individually controllable;

a controller for controlling the light output of each channel of the multichannel lighting unit, based on a control value in respect of the color associated with the first user interaction element;

a user interface device adapted to present a user interface as claimed in claim 1 for selecting the control value; and

a communication network for functionally connecting the user interface, the controller and the multichannel lighting unit.

12. The lighting system of claim 11 wherein the multichannel lighting unit comprise at least three channels: a first channel for emitting blue light, a second channel for emitting white light and third channel for emitting red, deep-red light or far-red light.

13. A method of controlling a multichannel lighting unit wherein each channel of the multichannel lighting unit comprises at least one light source for emitting light having a channel-specific spectral composition, 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 method comprising:

providing at least two user interaction elements, each user interaction element associated with a color producible with the multichannel lighting, 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, wherein 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 wherein the dynamic scale is depicted as a subrange of the static scale and overlaying said static scale,

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;

selecting, using the selector of a first of the at least two user interaction elements, a present control value for the color associated with the first user interaction element;

adapting the dynamic scale of a second of the at least two user interaction elements, based on the present control value selected in respect of the first user interaction element; and

controlling the light output of each channel of the multichannel lighting unit, based on a control value in respect of the color associated with the first user interaction element.

14. The method of claim 13 wherein the step of adapting comprises adapting the dynamic range of the second of the at least two user interaction elements to be a subset of the static range of the second of the at least two user interaction elements, wherein a minimum control value of the dynamic range is larger than the minimum control value of the static range for the second of the at least two user interaction elements.

15. A non-transitory computer program product, when running on a processor which is functionally coupled to or comprised by the user interface as claimed, is capable of executing the steps of the method of claim 13 .