white runway markings are gray

I notice the runway numbers are models and they're mapped with a white .raw file. They are a nice bright white, but the runway edges and piano keys are dull gray.Is it possible to fix the runway markings to brighten them? Or is the only possibility to darken the numbers?I found the .raw file used to color the runway edges, but apparently they lack the right environment mapping flags or something. Are rectangles like taxiway segments and the piano keys a model file, or only built-in to the sim code?