Fortunately, the camera allows you to pass commands to it via HTTP. The two we're interested in are:
http://<Camera IP or URL>/decoder_control.cgi?command=94 to disable IR and
http://<Camera IP or URL>/decoder_control.cgi?command=95 to enable IR.
This comes in handy because this means we can set up a task in Task Scheduler (on a machine running Windows) to periodically send a command to the camera to disable its IR lights (in case the camera has rebooted).
One way to send an HTTP request in Task Scheduler is to use PowerShell:
powershell -ExecutionPolicy unrestricted -Command "(New-Object Net.WebClient).DownloadString(\"http://<Camera IP>/decoder_control.cgi?command=94"&"user=admin"&"pwd=\")"
The above assumes that your camera uses the default "admin" account with a blank password. Of course, you should replace <Camera IP> with your camera's actual IP address.