Retrofit auto dimming rear view mirror?

[tophamn]

Tonight I sat in the car and shone my phone’s light at the rearview mirror. It dimmed the rearview and the side mirrors, so I know the auto-dimming works. But during the day a car behind me used high beams and the dimming didn’t kick in.

I believe this is correct behaviour - dimming only works when it's dark.

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[Crazymind]

I think you are right…