Hi guys, I'm currently preparing all the necessary hardware for a project, I'm trying to build a CCTV security system which can detect and recognize faces, and the CCTV will be turned on whenever motion is detected. I'm not familiar with raspberry pi camera modules, and currently thinking to buy a camera module with night on, because what I want is it will turn the light on automatically when it is too dark. So my questions are: Do I need to buy a light sensor seperately? Which camera modules are most suitable for my use? Any help would be appreciated, thanks a lot.