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.
macOS Catalina Now Available
Apple Seeds OS X 10.7.3 Build 11D36 to Developers
The delta version of the new build for updating from OS X 10.7.2 weighs in at 986 MB, while a combo version good for updating from any previous version of OS X Lion weighs in at 1.2 GB.
OS X 10.7.3 will be Apple's next free maintenance update for OS X Lion users. The current version, OS X 10.7.2, was released in mid-October and brought support for Apple's new iCloud services.