"During the day, computer screens look good—they're designed to look like the sun. But, at 9PM, 10PM, or 3AM, you probably shouldn't be looking at the sun. Tell f.lux what kind of lighting you have, and where you live. Then forget about it. F.lux will do the rest, automatically."

"Using a light source the right way can add dimension and beauty to a website design. Strong light sources create a stark contrast between light areas and shadows in a design, making the elements look more realistic and dimensional and less flat. Some websites opt instead for a dim light source to create a soft glow around particular areas of the website, to attract the eye more subtly."