How Do I Adjust The Brightness On My iPhone?
On the iPhone you can adjust brightness by going to the Settings app and then selecting Brightness. You can manually drag the Brightness slider to your preferred setting or you can choose to rely on the Auto-Brightness feature. Auto-Brightness will adjust the brightness of your screen depending on the current lighting conditions around you. For instance, if you are in a dark room the brightness will automatically decrease. Turn on the light and it will revert back to a brighter level.
You can adjust the Brightness on an iPad using the Settings app in the same manner. Or you can access the Brightness slider by double-tapping the Home button, then swiping to the right.