Hello,
I was flying the other day and I was noticing the Lights at the Terminal on my taxi out and I noticed that the Lights that are attached to the Concourse Building are really yellow than real world. So I found a really good picture that I think is a good example of what should tghe lighting color be and I hope you will take into consideration for the MAJOR update (even though V2.0 was a major update) so could be just a little bit more realism added into the simulation of flying.
Picture of OHare Airport South (soon to be Central) tower and overviewing H and G concourse