How does night vision work?

[topcop]

I am contemplating buying a two camera system for my apartment.  I want to try to conceal the cameras as best I can.

How does the night vision work?  Is it infrared or does in turn on a spotlight? 

[jsaus63304]

I have the Pro 3 and you can choose.  You can either use infrared night vision or have the camera turn on a spotlight upon motion.  You get color with the spot but the night vision is very sharp.  As well as capturing color video, the spot can act as a deterrent.  I turnrd off the spot on my porch because I did not want it coming on ever time I moved on the porch at night.

[TomMac]

As mentioned some of the newer cams also have normal lights in them… but as to the IR, it is at 850nm and during use you can see a slight red glow from the ir leds on the cameras, otherwise ( like from side ) it is not visible