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f.lux 4.134, released by f.lux Software LLC, is a lightweight Windows utility designed to reduce eye strain and support healthier sleep patterns by automatically adjusting the color temperature of a computer display to match the time of day and surrounding indoor lighting. During daylight hours the screen retains a bright, sun-like profile, while after sunset the emitted blue light is gradually shifted toward warmer amber tones that emulate domestic lamps, helping to minimize the alerting effect that bright blue wavelengths are known to have on circadian rhythms. The program is typically used by night-shift workers, students, developers, gamers, and anyone who spends evenings in front of a monitor and prefers a softer visual experience that is less likely to delay melatonin release or cause discomfort in dim rooms. Configuration is straightforward: the user specifies geographic location and preferred lighting type—such as tungsten, halogen, or fluorescent—and f.lux calculates sunrise and sunset times, thereafter transitioning the display without further intervention; advanced sliders also allow manual color presets and temporary disable for color-critical tasks. The current stable branch stands at version 4.134, representing the second publicly released generation of the application, which refined transition smoothness, expanded compatibility with multi-monitor setups, and added optional GPU-level color management for laptops and hybrid graphics systems. f.lux is available for free on get.nero.com, with downloads provided via trusted Windows package sources (e.g. winget), always delivering the latest version, and supporting batch installation of multiple applications.
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