Design a Traffic Light with data of a complete Column

[senior_freshmen]

Good Day, 

i want to implement a trafiic light, which is yellow/red when a specific value the Column exists. 

By now im only able to define the conditions for a manuel selection of the User. 

It would be very nice if someone could help me. 

[prieper · Accepted solution]

Open the "+" symbol aside of the expressions.
with a conditional expression you may assign a colour to the background or text etc.
Else you may add a column but choose "Representation" and then "Traffic Light Gauge" or the like and define your condition there.
Peter