The dash cams that offer LED illumination and claim 'Night vision' usually don't work well. If they do offer some illumination, it's only for a few feet in front of the camera, and you will have problems with reflections from your windshield. You are better off turning off these leds, and just finding a camera with adequate capabilities at night with available lighting. (Street lights, your headlights, etc.)
Night video quality varies widely. Make sure you look for samples of 'night'video online before you purchase a dashcam, but understand that lighting conditions vary drastically, and you are not likely to see license plate numbers unless the vehicle is directly in front of you, and somewhat close.
'Night video' is still useful in accident situations.
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