The key to defeating, any enemy living or undead, is to make them fight the battles on your terms. When the dead rise, and the world as you know it has collapsed you will need to understand that you will have to make the undead fight you on your terms and not simply run at the horde baseball bat swinging and guns blazing every time you see them, or hear their moan.
For centuries armies fought battles primarily in the day. Why? Because, human beings lack good night vision. We as a race cannot see in the dark well enough to identify friend or foe at any great distance. Zombies, however, don’t care if its day or night, they hunt using all of their senses, hearing, sight, and very likely smell. Humans, on the other hand, primarily rely on their sight to maneuver and function. While, there will be those who will say that they can fight the undead in the dark here why these engagements are highly discouraged, except in controlled engagements, and as a last resort.
Night Vision Devices: Since the Second World War nations have worked on and developed, some may even say perfected, devices that attempt to turn night to day. Everyone, who has not been living under a dark rock, has seen combat footage of American soldiers fighting in darkness through the lens of a camera equipped to film in the dark. These green hued films may make many think that getting a set of night vision goggles, will make them the next Sam Fisher and the key to ending the zombie threat. In reality, and not video games, night vision goggles have short battery lives and narrow the line of sight of the user. Also, they make aiming a firearm with any degree of precision difficult.
Fire: While fire as a weapon is not highly recommended, except when the trap for the undead has been properly prepared, it’s use as a means of illumination is invaluable when dealing with a society that no longer has the advantages and luxuries that we are currently use to. However, to use fire as illumination for night fighting, first you must know how to make a fire, something that has fallen by the wayside. A fire, also needs to be fed, which may be difficult in combat, and it will also attract attention from things other than zombies. And, of course, if the fire gets out of control, the results can be disastrous.
Flashlights: Flashlights, an item that almost every home has at least three of sitting around, though not all will likely have batteries, have advantages and disadvantages that intertwine with the two above. First, they require batteries that may become hard to find, and will run. Secondly, they attract attention, and as fire will, they degrade your natural night sight, meaning that other survivors may be easily able to ambush you. However, flashlight are readily available and cheap, generally speaking, something that cannot be said of night vision devices. Also, they are simple to use, and are not likely to cause runaway fires that burn down your base of operations.
In the end, what you have on hand will likely affect what means you use to fight the undead. However, it is ZAC’s recommendation that you avoid combat with the undead at night, unless that is your only option. Make them fight you on your terms, and give them only the minimum number of advantages.