Hey Perry,
Welcome to the forums!
With these cameras, each IR LED module either side of the Camera board has its own Potentiometer. I grabbed a unit off the shelf and have labbeled the Potentiometer on the board in the picture below:
You can adjust this potentiometer with a Phillips head screwdriver and it should adjust the ambient light required to switch on the IR LEDs while the board is active and powered.
Cheers,
Blayden
