I bought this camera to mount in window and capture movement outside my home, principally trains going past!

At night the camera picks up its own reflection in the glass and effectively blinds itself. 

There is a fix but it's not obvious. From the camera view page in Tapo app, click on the picture and 4 icons appear. Click on the third that looks like a sun or light icon. 

This will take you to video mode screen. Click on daylight mode. This will turn off the night vision infra red lights. 

Problem solved!