It's good if you're used to bright colors on map/dar opponent (red I assume would be ok). I for one prefer the opposite: dark map/bright enemy. I remember cooller had something like this a while ago (1-2 years maybe).
How does it look if you have your target through one of those lamp lights? I always have a problem aiming through those :(
i remember some study that was linked on esr a few years back that resulted in airforce pilots being able to react the fastest when a green light was lit(hope you understand that one sentence, can elaborate if not).