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by tzs 1218 days ago
> Once that's enabled iOS will now bring up a super secret popup menu whenever you double tap the screen with three fingers.

On current iOS you don't need to be in zoom and double tap. The zoom filter is also available by tapping the "Zoom Filter" setting which is 6 items below the Zoom setting in Settings -> Accessibility -> Zoom. The double tap in zoom thing is there to make it easy to quickly change the filter while zoomed.

This and the white point setting void-pointer suggested are both controllable from Shortcuts.

There is a Zoom action that supports turning zoom on, off, or toggling it, a White Point action that supports turning it on or off, and a Brightness action that supports setting the brightness to a given percentage or asking for the brightness.

I just tried making two Shortcuts, "Low Light" and "Normal Light".

Low Light:

  Turn Zoom On
  Turn White Point On
  Set Brightness to 0%
"Hey Siri, Low Light" then works. It does leave you zoomed, so you need to cancel that, but then you are left at 0% brightness and whatever Zoom filter you have set is in effect. "Turn White Point On" will set the white point reduction to whatever percentage you have it set to in the Reduce White Point system settings.

Normal Light:

  Turn Zoom Off
  Turn White Point Off
  Set Brightness to <ask each time>
That does what you'd expect. Siri asks you what brightness you want from 0 to 1. You can change that to a specific percentage if you don't want to be prompted.

PS: This only fully works on iOS. On iPadOS zoom filters only work while actually zooming, and then only apply to what is shown in the zoom rectangle. On iOS the zoom filter applies when zoom is enabled regardless of whether or not you are actually zoomed.

The white point reduction does work on iPadOS so you do get some lowering of minimum brightness but not as much as on iOS when you can use both.