There seems to be a strange light bug.
During the night, the moon seems to be the primary light source.
However, when the sun start coming up, the world becomes suddenly very dark as if the moonlight stopped suddenly.
For example, if we start a new mission, and set the time to 10/09/1993 at (10th of September) and set the time to 06:15, it's quite bright outside, as the moon is almost at its highest.
However, at 6:20 it starts getting darker, until the moon completely disappears from the sky at 06:21.
This makes it quite hard to create missions in the morning.