Free Download f.lux offline installer for Windows PC. It's a simple and easy-to-use application designed to automatically adjust your desktop brightness and colors according to the lighting conditions of day and night.
f.lux Overview
f.lux makes your computer screen look like the room you're in, all the time. When the sun sets, it makes your computer look like your indoor lights. Moreover, In the morning, it makes things look like sunlight again.
Tell f.lux about the type of lighting you have and your location. Then forget about it.