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Download f.lux for Windows - Free software to adjust your screen color and brightness


How to Download and Use f.lux to Reduce Blue Light Exposure and Improve Your Sleep Quality




If you spend a lot of time in front of screens, whether it's for work, entertainment, or communication, you may have experienced some of the negative effects of blue light. Blue light is a high-energy wavelength of visible light that is emitted by the sun, but also by digital devices such as computers, phones, tablets, and TVs. While blue light has some benefits during the day, such as boosting your mood, attention, and reaction time, it can also disrupt your sleep-wake cycle and cause eye strain, headaches, and fatigue at night.


Fortunately, there is a simple and effective solution to this problem: f.lux. f.lux is a software that makes the color of your computer's display adapt to the time of day, warm at night and like sunlight during the day. It's based on scientific research that shows how light affects your circadian rhythm, which is your internal clock that regulates your sleep and wakefulness. By using f.lux, you can reduce your exposure to blue light at night, which can help you sleep better, feel more refreshed, and avoid health problems.




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In this article, we will show you how to download and use f.lux for different devices and platforms, how to set up and customize it according to your preferences and needs, and how to troubleshoot common issues with it. We will also answer some frequently asked questions about f.lux at the end. Let's get started!


What is f.lux and why do you need it?




Before we dive into the details of how to download and use f.lux, let's first understand what it is and why you need it.


The effects of blue light on your eyes and circadian rhythm




Blue light is a short-wavelength, high-energy light that is part of the visible spectrum. It has some positive effects during the day, such as enhancing your alertness, mood, and cognitive performance. However, it also has some negative effects at night, especially when it comes from artificial sources such as screens.


One of the main negative effects of blue light is that it suppresses the secretion of melatonin, a hormone that regulates your sleep-wake cycle. Melatonin is normally produced by your pineal gland in response to darkness, signaling your body that it's time to sleep. When you are exposed to blue light at night, your melatonin production is reduced, which makes it harder for you to fall asleep and stay asleep.


Another negative effect of blue light is that it causes eye strain, which is a condition that occurs when your eyes get tired from intense or prolonged use. Eye strain can cause symptoms such as dry eyes, blurred vision, headaches, neck pain, and difficulty focusing. Eye strain can also affect your mood, productivity, and overall well-being. Eye strain can be worsened by factors such as glare, flicker, contrast, brightness, and distance from the screen.


By reducing your exposure to blue light at night, you can avoid these negative effects and improve your sleep quality and eye health. This is where f.lux comes in handy.


The benefits of f.lux for adjusting your screen color temperature




f.lux is a software that automatically changes the color temperature of your screen according to the time of day and your location. Color temperature is a measure of how warm or cool a light source is, expressed in degrees Kelvin (K). The higher the color temperature, the more blue light it emits. The lower the color temperature, the more red light it emits.


During the day, f.lux matches your screen color temperature to the natural daylight, which is around 5500K to 6500K. This helps you stay alert and focused, and also prevents your screen from looking too dim or yellowish compared to the ambient light.


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At night, f.lux gradually lowers your screen color temperature to a warmer range, which is around 2700K to 3400K. This mimics the sunset and reduces the amount of blue light that reaches your eyes. This helps you relax and prepare for sleep, and also prevents your screen from looking too bright or bluish compared to the dark surroundings.


By using f.lux, you can enjoy the benefits of blue light during the day and avoid its drawbacks at night. You can also customize your settings to suit your personal preferences and needs, such as your wake time, bedtime, color presets, and more. We will show you how to do that in the next section.


How to download f.lux for different devices and platforms




f.lux is available for different devices and platforms, such as Windows, Mac, Linux, iPhone/iPad, and Android. Here are the steps to download f.lux for each of them:


How to download f.lux for Windows





  • Go to and click on the "Download f.lux" button.



  • Save the file "Flux-setup.exe" to your computer and run it.



  • Follow the instructions on the screen to install f.lux.



  • After the installation is complete, you will see a small icon of a sun in your system tray (near the clock). Click on it to open f.lux settings.



How to download f.lux for Mac





  • Go to and click on the "Download f.lux" button.



  • Save the file "Flux.zip" to your computer and unzip it.



  • Drag the file "Flux.app" to your Applications folder.



  • Double-click on "Flux.app" to launch f.lux.



  • You will see a small icon of a sun in your menu bar (near the clock). Click on it to open f.lux settings.



How to download f.lux for Linux





  • Go to and choose the appropriate package for your Linux distribution (such as Ubuntu, Debian, Fedora, etc.).



  • Download and install the package using your package manager or terminal commands.



  • You will see a small icon of a sun in your system tray (near the clock). Click on it to open f.lux settings.



How to download f.lux for iPhone/iPad





  • f.lux for iPhone/iPad requires iOS 9.3 or later and a jailbroken device. If you don't have a jailbroken device, you can use the built-in Night Shift feature instead.



  • To jailbreak your device, follow the instructions on .



  • To install f.lux on your jailbroken device, open Cydia and search for "f.lux". Tap on it and install it.



  • You will see a small icon of a sun on your home screen. Tap on it to open f.lux settings.



How to download f.lux for Android





  • f.lux for Android requires Android 4.4 or later and a rooted device. If you don't have a rooted device, you can use the built-in Night Light feature instead.



  • To root your device, follow the instructions on .



  • To install f.lux on your rooted device, go to and download the APK file.



  • Enable the installation of apps from unknown sources in your device settings.



  • Open the APK file and install f.lux.



  • You will see a small icon of a sun in your notification bar. Swipe down to open f.lux settings.



How to set up and customize f.lux according to your preferences and needs




After you have downloaded and installed f.lux on your device, you can set up and customize it according to your preferences and needs. Here are some of the things you can do:


How to set your location and wake time




f.lux uses your location and wake time to determine the best color temperature for your screen throughout the day. To set your location and wake time, follow these steps:



  • Open f.lux settings by clicking or tapping on the sun icon.



  • Click or tap on the "Change" button next to your location.



  • Type in your city name or zip code, or use the map to find your location.



  • Click or tap on the "Done" button to save your location.



Click or tap on the "Change" butto


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