940nm IREDs are not visible to the human eye but are visible to a CMOS sensor, so that would be pretty easy to rig up without being too noticeable. The main iss

940nm IREDs are not visible to the human eye but are visible to a CMOS sensor, so that would be pretty easy to rig up without being too noticeable. The main issue is that you would need a lot of them because most security cameras are filtered for IR light and you would have to sufficiently overpower them unless it was night time.