A non-infrared day/night camera switches to monochrome in low light without built-in infrared illuminators. It removes the infrared-cut filter to gain sensitivity and relies on existing light. That avoids infrared glare and insect attraction, but it needs some light to produce an image.
The difference is the illuminator, not the sensor. Removing infrared changes what the camera can see and what can go wrong.
Why drop the illuminator
Infrared light reflects from rain, dust and nearby walls, and it attracts insects that trigger alerts. A camera without it cannot create those artifacts, so images stay cleaner where light already exists.
Where it will not work
With no light at all, a non-infrared camera records black. Porches, well-lit lots and interior rooms suit it; unlit fields and long driveways need infrared or thermal instead.
Related:Glossary: Night vision surveillanceCommercial security camera systems