Chris:
Night time is very difficult to implement fairly because of variation in monitors. Since some look "darker" than others, we have brightness adjustments that neutralize the night.
Bottom line: anyone who doesnt want to fly in the dark can go to video settings, increase the gamma slider as desired, and see as if it were noon. Those who know the trick have a huge advantage over those who dont, and if everyone has gamma up to play there isnt any night effect anyway.