Ive seen handheld video cameras with night vision modes. They arent super good but surprisingly decent at close range!
I dont expect the video recording ability to be super good on either type f video ercording. Memory like that doesnt write really fast when compared to normal video tape, so the image may be jerky.
However sometimes you dont need a real detailed image, just a blury image showing the bad guy raised his hand with a gun is enough to clear the police officer of wrong doing. Or heck a traffic stop with a woman who later claims she was solcited by the officer, you dont need a good picture on that either.
I am kind of tempted to get one. Though a 50 dollar pocket recorder would be able to perform some of the same ability in reguards to proving officers innocent.
However, having the suspect be recorded on an interview while the suspect doesnt know it, because the flashlight doesnt look like a camera, thats a very good thing.
That aspect may provide for some constitutionality issues in some states though. It shouldnt where i live, unless the officer leaves the flashlight alone with the suspect. (You cant leave a recording device somewhere to record without a warrant.)