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ioreg usually reports the nits value in some property.

On an M1 you can run the following:

    ioreg -r -c AppleCLCD2 | grep -i nits


at least on the iMac it doesn't work, tried:

  ioreg -l -f | grep nits
which should list properties of all objects, and the display I could find:

  ioreg -r -c AppleBacklightDisplay




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