Folks who already bought Lion can in fact re-download it, if they hold down Option when clicking on the Purchased tab. That secret shortcut makes Lion reappear in the list.Customers who never purchased Lion are out of luck as far as the App Store goes, though the OS X Lion USB Thumb Drive is still available via the Apple Online Store for $69.
With the Option key trick, customers who own Lion and, for whatever reason, want to install it fresh on a compatible Mac, can do so.
Night mode is an automatic setting which takes advantage of the new wide-angle camera that's in the iPhone 11 and 11 Pro models. It's equipped with a larger sensor that is able to let in more light, allowing for brighter photos when the light is low.