You can find instructions for accessing settings for Need4viz graphics: Format Custom Element.
For the Traffic light, the available parameters are:
Extended parameters
Global → See the user guide for the “Global” section
here
Options
Orientation of Traffic Light : Set the orientation (vertical by default) of the gauge. You can also change the order of the lights in the Traffic Light (by default the first light - green - is on the bottom of the vertical traffic light and on the right of the horizontal traffic light).
Light options : You can choose here the color of the off light and add an optional ringing light (set thickness to 0 to disable it). You can also specify to not use gradient colors for lights.
Global style : Specify here the background color of the traffic light and a border for the traffic light.
Tooltip : Depending on the final size of the traffic light, the tooltip may not appears completely so you can disable it here.
Ranges
Ranges colors : Set here the number of lights that will be used (3 by default, it can be a value between 1 and 5)
Ranges 1..5 : Set for each range, the color corresponding (by default, the 3 first colors used are Green, Yellow & Red)
Export SharePoint → See the user guide for the “Export SharePoint” section here
Export HTML → See the user guide for the “Export HTML” section here
Export FTP → See the user guide for the “Export FTP” section here