make sure you get a camera with 0 LUX and IR LED`s that way it will be easy to see at night. most cameras swich to B&W at night, it makes it better to see.
Keep in mind that all IR LED`s are not the same, some are more powerfull than others, make sure the camera that you get has more than 60 IR LEDs, i have installed many cameras and those that only have about 16 IR LED don`t work that well for outdoor.

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