Using the computers and devices in low light, or for extended periods of time can create strain on the eyes and be destructive for productivity. Here are some things I am using to mitigate this.
f.lux: Windows App for colorizing the desktop.
Firefox Browser Plugin: Dark Backgrounds and Light Text. Dark, Invert, custom CSS, or dispable by web address.
Word 2016 Dark Theme for desktop Applications (makes everything dark except the ‘paper’), and the above mentioned plugin makes the web app totally dark.
Display Fusion: use shortcut keys to change Wallpaper themes.