The point about darkness is an interesting one.
USA subs couldn't use their periscopes at night unless their was bright moonlight - they simply didn't gather sufficient light. The Brits developed one scope for night and another for day; having a larger periscope head didn't matter at night as it wouldn't be spotted anyway.
Not sure about the Germans. They tended to have excellent optics.
As far as the sim goes, you need to be able to do night submerged attacks as it doesn't handle surface attacks at all well (NYGM does that pretty well, GWX not as well, and stock is plain useless).
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