1. If camera powers on, the infrared lights should turn on in red color when light around front part of camera is dim and weak.

2. If people wanna see image of camera at night when there is no light around the front part of camera, the infrared lights on camera should turn on in red color. When infrared lights are on in red color, the image of camera turns black and white, not colorful.

Therefore, we can judge if camera powers on or turns into night mode by infrared lights.

You can use hands to cover the front of camera. If you can see red lights,  infrared lights turns on.