well just think about how Anything was lighted back then in that time period, high wattage bulbs werent very easy to make and expensive to use so most "routine" environments were very shadowy and dimly lit so taking a sub into account it was probably better lit then most buildings yet still be engulfed in shadows that make vision for maps and charts not all that easy
movies andf games play tricks with lighting to serve ther purpose the want so as mentioned before you must decide if you want it to be in line with realism or to satisfy the image you got from some movie
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