I wont give you a definative answer (cause i dont want to be misleading), but this varies on mods. I can tell you that max visual distance for the AI at night, is a little more then half its max visual distance during the day.
In TM, i have unit types with their own visual nodes.
Escorts see farther then merchants.
Warships see farther then escorts
Planes see farther then warships.
They all dont share one visual node, they have their own. This means that your night surface approch will be shorter, or farther, based on unit type.
An unescorted merchant, you can probably get close enough to count how many heads are walking around on the deck. An escorted mercant, not as close. The merchant might not see you at 3,000 yards, but its escort might.
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