I found that with the ingame gamma setting at default, it was as easy to see at night as during the day, just with everything appearing in blue/grey shades at night. Setting the gamma to a lower level made the night darker, and I thought these pics were pretty of Sakura at nighttime. The last picture shows the increased brightness when viewing at nighttime through a weapon scope, which makes it a lot easier to see ground details and also mobs. Another idea to help with seeing your way at night is to buy one of the blue energy blade weapons at a TT and equip that as a light source.