When Apple released macOS Sierra for their mac computers in 2016, they left out some models for certain features. Night Shift was one of those features. After dark, Night Shift automatically shifts your display's colors to the warmer end of the color spectrum. This Installer was created to replace the CoreBrightness framework, allowing all Macs to take advantage of this useful feature.
"Many Studies have shown that exposure to bright blue light in the evening can affect your circadian rhythms and make it harder to fall asleep. Night Shift uses your Macs clock and geolocation to determine when it's sunlight in your location, then it automatically shifts the colors in your display to the warmer end of the spectrum. In the morning, it returns the display to its regular settings. Pleasant dreams”
- JV Chamary from Forbes