Do these self defense flashlights work well through car windows? Sometimes I have people bang on my car window in the shady parts of town. I definitely don't want to open the window, however want some level of defense. These flashlights work well in sun daylight too.
Would they work? Certainly. Would they work as intended? I doubt it. Two things to consider:
Refraction and reflection. The light density of these flashlights is extreme and you will have to be very careful not to be blinded by your own light, which would be especially problematic while driving in the dark.
Provocation leading to unintended outcomes. They bump your windows to tease you, so what? You will probably provoke these guys to smash your window if you play their game, which means that you gain nothing. They are teasing you to do something which justifies escalation or they would smash the window straight away.