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Samsung’s excellent Blue Light Filter and why it Matters

Sprint Product Ambassador




Blue light causes glare.  But what if you have your S8 in AMOLED Photo mode, or have manually customized the color temperature in Adaptive Display mode?  That’s an important step in getting more accurate colors, but that’s not what the Blue Light filter is about.  You see, even if your screen is accurately displaying whites and white, and not blueish, it is still send blue light waves into your eyes which inhibit the production and absorption of melatonin, a natural chemical required to make you feel sleepy, and then eventually make you ready to wake up feeling refreshed.  In other words, you are reprogramming your body’s circadian rhythms.


The Blue Light filter actually creates an amber colored light on your phone when the sun goes down.  At first, it is subtle and mostly imperceptible, but the amber light gets stronger as the evening goes on.  Blue light filters are not required during the day.





Now you’ll be able to read at night and still feel sleepy.  Scientific studies have shown a link between light at night and diabetes, heart disease, obesity, macular degeneration, glaucoma, cataracts, and both prostate and breast cancer.  You can read more about the science behind it at the following links: 


Here is a excerpt from the Harvard study:

  • Use dim red lights for night lights. Red light has the least power to shift circadian rhythm and suppress melatonin.
  • Avoid looking at bright screens beginning two to three hours before bed.
  • If you work a night shift or use a lot of electronic devices at night, consider wearing blue-blocking glasses or installing an app that filters the blue/green wavelength at night.
  • Expose yourself to lots of bright light during the day, which will boost your ability to sleep at night, as well as your mood and alertness during daylight.


Screenshot_20170619-135653.pngYou can access the Blue Light Filter menu from the "Display Settings" in your phone's "Settings" app.  In order for the automatic “Sunrise to Sunset” mode in to work in Samsung’s blue light filter, you’ll need location, a.k.a., GPS on all of the time.  I find that uses more battery power than I would like, so I just set a custom schedule of 7:00 p.m. to 7:00 a.m.  Yeah, this doesn’t take in to account the changing sunrises and sunsets through-out the year, but it gets the job done with no discernible impact on battery life. You can also toggle it on or off from the top menu drawer on your phone.



I’ve used an excellent app called “Twilight Pro”, that accomplishes a similar goal as Samsung’s blue light filter, and can turn on accurately at sunset and turn off at sunrise without using GPS, but it is technically using a screen overlay, which can introduce some slight problems.  Some apps see screen overlays as security threats, as several pieces of malware can use an overly to spy on every screen touch you make and every character you type, including account numbers and passwords.  Of course, Twilight Pro isn’t malware, and doesn’t spy on you, but all of this is moot when using Blue Light Filter, which runs natively, and will not show up as a false positive screen overlay.  Bottom line is, I don’t need Twilight Pro on my S8.



Disclaimer: The Product Ambassadors are Sprint employees from many different parts of the company that love technology. They volunteer to test out all sorts of Sprint devices and offer opinions freely to the Community. Each Product Ambassador shares their own opinions of these devices, therefore the information in this post does not necessarily reflect the opinions of Sprint. The PA's do not represent the company in an official way, and should not be expected to respond to Community members in an official capacity. #sprintemployee