Wednesday, March 30, 2016

f.lux on Ubuntu

"Light at night is bad for your health, and exposure to blue light emitted by electronics and energy-efficient lightbulbs may be especially so.
Until the advent of artificial lighting, the sun was the major source of lighting, and people spent their evenings in (relative) darkness. Now, in much of the world, evenings are illuminated, and we take our easy access to all those lumens pretty much for granted.
But we may be paying a price for basking in all that light. At night, light throws the body’s biological clock—the circadian rhythm—out of whack. Sleep suffers. Worse, research shows that it may contribute to the causation of cancer, diabetes, heart disease, and obesity.
But not all colors of light have the same effect. Blue wavelengths—which are beneficial during daylight hours because they boost attention, reaction times, and mood—seem to be the most disruptive at night. And the proliferation of electronics with screens, as well as energy-efficient lighting, is increasing our exposure to blue wavelengths, especially after sundown." (http://www.health.harvard.edu/staying-healthy/blue-light-has-a-dark-side)

f.lux adapts the display settings based on your location to the time of day, warm at night and like sunlight during the day.
It can be installed on Ubuntu via ppa . To begin open a terminal (ctlr+alt+t) and use the following commands : 
sudo add-apt-repository ppa:nathan-renniewaldock/flux
sudo apt-get update 

sudo apt-get install fluxgui

Once installed you can launch the application from Dash and configure it using the GUI based indicator applet . 




The settings can be adjusted by right clicking the applet and selecting preferences : 


To work properly f.lux needs to know your coordinates (latitude and longitude)  


There are 5 temperature settings that can be adjusted to your own preference :