Lightbulb is a program that allows you to run the night mode in Windows. It will reduce the emission of blue light, so that the use of a computer after sunset will have less impact on sleep hygiene and eyesight. The program is ready for operation immediately after installation:

the configuration for a given location will be automatically downloaded from the Internet, so that the night mode will be synchronized with sunset and sunrise. You can also set these values manually. In addition, it is also possible to specify the color temperature for both night and day mode, and to set how long the transition between modes is to last.

Lighbulb is an open source program, its code can be found in the GitHub repository.