Night and clouds are splendid special effects. I am astonished by the way HiTech has implemented the effects in the game.
Having said that, I have to confess that I play 'Aces High' to shoot mofos down ... not to look at special effects.
If I come into the arena and it's dark, I leave; if it becomes dark and I'm in the arena, I leave; if I up a field that's overcast, I look for a field that's in the sun.
While it's true that low light conditions affects both sides, I don't play AH so I can participate in low light conditions. Target acquisition is just too difficult.
As someone pointed out, it's not just dark, heck the twilight which precedes and follows night is just as bad. Low light conditions must last for close to 20-30 minutes! Man, that's too much.
I'm sure HiTech and Pyro will find playable compromises.
By the way, anyone else have trouble distinguishing between squadmembers and hostiles on the map? The orange under low light looks red to me.

curly