Pandoras Box > Devices and Layer Parameters > Light Layer

The Color parameter allow changing the color of the emitted light rays. Please refer to this chapter if you want to learn how to use the color picker.

External Control via DMX, Widget Designer, etc.

You can control the color parameters externally, simply assign a value between 0-255 to each color.
For DMX control, the chapter DMX Tables lists all parameter information, for other external control e.g. via the Widget Designer the Parameter List is of interest.