How to make your iPhone screen darker than the lowest Brightness settingWhat do you do if the iPhone's lowest brightness setting isn't enough? Go even darker.
Much as I appreciate the iPhone's blindingly bright LED screen in direct sunlight, it's not always the nicest sight to see in a nighttime environment. This is especially true for iPad pros and iPhone users alike who may need their device for use in darkened theaters or while surveying the night sky.
In short: When you need to use your iPhone or iPad without blinding yourself or nearby neighbors, sometimes iOS' lowest Brightness setting just doesn't cut it. But there's a better way, thanks to Apple's Accessibility settings.
How to make your iPhone darker than the lowest Brightness setting
Open the Settings app.
Go to General > Accessibility > Zoom.
Enable Zoom.
Set the Zoom Region to Full Screen Zoom.
Tap on Zoom Filter.
Select Low Light.
Your screen will immediately dim; from here, you can do more minor brightness adjustments from Control Center. (Those of you hoping for another way to ...
Source:
How to make your iPhone screen darker than the lowest Brightness setting