The lighting in Arma 2 is dependend on the date and time of the particular mission. I just checked a night server and it was almost pitch black only the bright sand on the shoreline and the sea itself was illuminated and just as I thought there was no moon to be seen, hence the extreme darkness. So I wanted to know if there maybe just happened to be a full/half moon when you were playing prior to the patch, because these dark nights are definitely common in Arma 2. The mission date is crucial here. I just placed myself in the editor, set the mission time to 19:00hrs and checked how dark it was ingame. It was very dark and this had two reasons: First, there was no moon visible. Second, I left the mission date on Oktober 11th, 2008 which is the standard mission date. Then I just changed the month to December and left the time at 19:00hrs and voilà it was pitchblack. So I changed the month to July and now there was still daylight, with the sun slowly getting ready to set.^^ That means that if the servers have a real day/night cycle and a date progression it could be that we are currently in a new moon lunar phase where just no moon is visible. So the real question is if a server restart or an update resets the mission date or not. If not you could just check the different lunar phases of 2008 to check if you could play on a nighttime server without the need of NVGs. :D