If you are experiencing IR reflection issues from number plates during darkness, it is recommended to try the settings below:
Exposure to 1
Turned off WDR
Turned off BLC
Adjusted shutter speed to 1/200
Log in to the camera and select
Advance >> Video / Audio >> Quality Advance
Select the 'Night Mode' tab.
Under 'Video Quality Mode' you will also find some predefined settings for different ANPR applications.