I've been thinking a lot about this because I recently put up a cam on my garage facing into an alley with no lighting at all in it.
Last week some shifty looking guy comes right up to my garage, takes off his backback and stands there with the (red)
IR light from the camera hitting him in the side of the face from 3 feet away and he never once noticed the camera. He then goes away without the pack carrying something that looks like a fire extinguisher only to duck back towards my garage 3 minutes later when a car comes down the alley. Puts the pack back on and leaves, again no notice of the camera lights.
Got a great look at him but if the criminal element is too stupid to even look for the cameras I'm going to have to rethink things a bit