Yes, C-mount lenses can be adapted to Micro Four Thirds, but not every CCTV lens is a good fit. C-mount is a standard mount, while CS uses the same thread with a shorter flange distance, so that difference matters when adapting.

The biggest issue is image circle: many CCTV lenses were designed for much smaller sensors than Micro Four Thirds, so they may vignette heavily or show a circular image unless you crop. Longer focal lengths may cover better, but it depends on the specific lens.

Optical quality is also variable. Many CCTV lenses were built for surveillance use, not high image quality, so sharpness and rendering may be poor by modern stills standards. That said, some people use them intentionally for distinctive, experimental looks.

As for low light, a fast lens can help, but these lenses do not magically allow video in “virtually no lighting.” Low-light performance still depends on the lens speed, sensor, and scene brightness.

Bottom line: they can work, but research the exact lens model first—especially sensor coverage and mount type—if you want more than a creative special-effect lens.