įast transitions: 20 second fade at sunrise and sunset. Make sure your computer’s internal Timezone settings are correct under System Preferences > Date & Time > Time Zone.

If you’ve been traveling, you might need to update your location. You can also use postal codes (US only), the name of a nearby city, or map coordinates (find them on the map at /map.html).

Working late: for extreme night owls, removes solar timing and gives 14 hours of bright waking light.įor most machines, f.lux can automatically detect your location with OS X Location Services. For large screens this setting is probably not strong enough to remove all alerting light. Recommended colors: Use these for the first week while you get used to the change of colors and discover how you like to use f.lux.Ĭustom colors: Custom color control, click the time of day you want to change and then drag the slider to your preferred color temperature.Ĭlassic f.lux: At sunset, f.lux will fade to 3400K, and turn off at sunrise. f.lux will default to the Recommended colors preset. There are several presets you can choose from. The f.lux preferences window lets you change and preview settings. You can go to sleep anytime with f.lux - whenever you feel sleepy. It removes as much alerting light from your screen as possible so that you can feel your body growing tired. The Bedtime setting changes with your wake time. If you usually wake up before sunrise, you might prefer a more moderate (4500K or brighter) Sunset setting.īedtime is the time before sleep when you’re getting ready for bed (or already in it). Sunset colors are designed to work well with normal warm white room lighting. If you are an early riser, this is also your pre-sunrise morning setting. Sunset is when the sun has set, but you are awake.

If you prefer very warm daytime colors, select Options> Expanded Daytime Settings from the f.lux menu. By default, f.lux is at 6500K during the daytime, and does not change your screen’s color. f.lux Preferencesĭaytime is whenever the sun is up in your location. The f.lux menu can always be found to the left of your system clock. You can open up Preferences any time to view and change your f.lux settings. f.lux uses this information to create a custom lighting schedule for you. Here, you can enter your location and set your usual wake time. Once f.lux is installed and running, you should see the f.lux Preferences window appear. zip file - it should be in your Downloads folder.

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