Just Get Flux. Your Eyes Will Thank You.


Flux screen brightness adjusterDuring the day, when your office or other room is lit mostly by the sun, the natural light has a blue tint to it. As does your PC's monitor. Which is all fine. Your monitor is comparatively bright, and is visible comfortably in daylight.

But as evening falls, and you turn on the electric lights, your room takes on a less blue and more of a yellow hue. And the overall level of light is less than during the day. And yet your PC monitor is still at full brightness, and still blue, which makes your eyes tired.

Which is where a brilliant program called Flux comes in. I've written about it before, but there have been numerous updates so it's about time I mentioned it again. If you don't have it, and you use your PC both during the day and at night, you need it.

Flux automatically and almost unnoticeably adjusts your display so that, as the sun sets, your screen loses some of its blue tint. It makes your eyes more comfortable, regardless of when you use your computer. Flux knows your location (though you can set it manually if required), and therefore needs very little configuration. Just download it from www.justgetflux.com and install it, and the job is done. It's a 0.5 MB download and is malware-free according to VirusTotal and Web of Trust.

Flux is one of the first things I install whenever I set up a new computer for myself or anyone else. Take my recommendation and make it yours too.

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I used Flux for two years previously and the color temperature with the inbuilt Night Light is equally as good for my eyes and I prefer it to Flux however as with anything my opinion is subjective and others should decide if it is for them or not.
I am simply advising it is an available option for those who might be interested.

The latest Creators Update for Windows 10 includes an option in Settings/Display/Night Light to dim your screen between whatever times your want and the dimming level is also fully adjustable.
This might have been there previously but I only found it recently and in the two weeks I have been using it it has worked perfectly.
No need for 3rd party apps.

You write "... to dim your screen ...". IMHO that is not enough.

The important thing is that the color temperature gets shifted to more reddish and away from blueish light.

Does 1703 (Creator's Update) do that?

Uninstalled. As evening approaches, it switches back and forth between day/night mode, causing the screen to flash from night mode to day mode to night mode. I like the differences in day vs.night, but I can't take that flashing back and forth.
EDIT: Correction to above---IT'S NOT F.LUX. I installed Sunset Screen, and it is exhibiting the same thing. So it is something in the computer video? not in the program. Unfortunate, as I like what it does.

F.lux vs SunsetScreen

Here are the main differences between these two softwares.

F.lux has the capability to self-adjust to the sunrise and sunset times while you have to enter manually these values in SunsetScreen. All you have to do in F.lux is to indicate your location and F.lux will do the rest.

As I already said in another comment, you will find the exact values of sunrise and sunset times for the place where you are located on this website : http://www.timeanddate.com/sun/

SunsetScreen, on its side, has a capability that F.lux doesn't have : it may adjust not just the tone of color of your monitor for the day and for the night, but also the brightness of your monitor by increments of 1%. That capability is a very handy one because you may define a different brightness for the day and for the night, also, you may change the brightness at any time you want.

Make your choice : do you feel lazy and wants the software to adjust by itself the sunrise and sunset times or do you want more control on the brightness of your monitor ?

I know that every monitor offers means to adjust its brightness, but it is usually a little bit more laborious to do this with these means than to use the simple capability of SunsetScreen.

The website offers some interesting research explaining the blue light effect. It got me to thinking that video gaming terminals in casinos must exhibit the same eye strain effect after sunset and therefore players who encounter betting losses should have legal grounds against those casinos.

I have dry eye, which can get pretty painful. Since I started using Flux, I don't get dry eye any more from using the computer.

Those who will use this kind of software should adjust correctly the sunrise and sunset times.

You will find these exact values for the place where you are located on this website :

A long time ago, I tried using a similar app, whose name I cannot remember, which didn't give me satisfactory results. That being said, I would very much interested in trying again with either this app or the one suggested by Sputnik. If it turned out that I just didn't care to continue using it, can this be removed by uninstalling it?

Thank you.

Hi HisSon.

Maybe that I misunderstood the meaning of your question.

If your question was to know if the changes brought by this software to your monitor are reversible if you uninstall the software, the answer is "yes". But the changes are also immediately dropped down when you close the software.

Hi Sputnik.

If this software is installed and then uninstalled, will the monitor settings return to the way they were before installing the program. After reading your response and thinking about writing this reply I should have known that the answer has got to be yes.

Not sure though what you mean by closing the software unless it's loading the portable version on a Smart Drive and removing the Drive cancels out the effect of the Program.

Whew! Sometime I can make the obvious complicated.

Thanks for your assistance.

All the best to you.

Hi, HisSon.

Here is what I meant by "But the changes are also immediately dropped down when you close the software." :

When you press the "X" button in the upper right of SunsetScreen's window, the program doesn't really shut down. It is just minimized in the Notification Area in the taskbar, just beside the clock.

What I mean by "closing" the program is to right click on the SunsetScreen's icon of the Notification Area and chosing "Close Program" in the contextual menu. At this moment your monitor will return to its normal settings.

The thing is the same for the installed version and for the portable one.

Hi HisSon.

You will find a portable version of SunsetScreen at this address :

For Android, I looked for a version on Google Play Store. Similar titles... many, but I didn't find this.

A clone, though, is called 'Twilight,' by Urbandroid Team. Their description includes a big wink-wink towards an unnamable source-of-concept (which would be Flux). I've only just gotten Twilight of course, but it's user rated at 4.6 out of 5 - and to me the quality seems top notch so far.

I've used both f.lux and redshift on my Linux PCs and laptop to adjust the color temperature in the daytime, which I find too bluish usually.

There's no differrence between this version and the one I downloaded over 2 years ago! Why did you say it had been updated recently??

Does this only apply to PC Monitors? What about laptop screens?

It applies to any monitor that is connected to your computer. I have it on my laptop/tablet, and it works on that screen, as well as any monitor or TV I've connected it to until now.

Unfortunately Flux has a Win/ADWare Agent-59030 loader and SunsetScreen shows a Thega/JOBKNaC

Delighted to learn that they are FALSE positives. The information I received while downloading both Flux and Sunset was alerted by my SecureAPlus v.4.3.1 as "possible malware file". Glad to hear the good news that they are false positives and will give them a try. Thanks for your information.

... and yes, I know, I'm going off topic here.

I am not inclined to even look at what your "SecureAPlus v.4.3.1" actually is and where it comes from.

It always amazes me to see, hear and read what truly exotic pieces of software some people entrust their computers to.

And all too often there seems to be not one thought about getting a second opinion from a proven on-demand standby as for example Malwarebytes Free.

Or to do the VirusTotal scans (BIG THANKS, MC!) yourself...

SAP 4.3.1 is an online Universal AV detector that poped up what was mentioned for Sunset and Flux as it was DLing, and after your and MC's assurances of a false positive, I applied one of it's great (for me) features, that allows me to disregard the warning and not just have it automatically deleted or quarantined as do most AV scanners... as I think it should be MY choice. It uses AHNLAB, AVG, Avira, BitDefender, ClamWin, EmiSoft, ESET, McAfee, MSE, QuickHeal, Sophos and TotalDefense as it scanning engines. The information that Sunset and Flux generated false positives and assurances that they are False Positives is a very worthwhile determination that I am not really capable of determining without a lot of research that you and MC have provided, and I am greatfull... one of the reasons I subscribe to Gizmo and DonationCoder. Thanks for your observations.


As a recommendation: I NEVER download ANY software without first scanning it on VirusTotal. I use Firefox with the VTzilla add-on and ALWAYS run a fresh scan on any software file before accepting or opening the download. Even if the pop-up says that the file was just scanned on VirusTotal only an hour or two before, I always run my own fresh scan. My computer's health is way too important to me and I have neither the time nor the patience to rebuild my digital life after accidentally downloading something malicious. Some people get in a hurry and think it's unnecessary and takes too long, but it normally takes only a few seconds. As the saying goes, there's never time enough to do something right, but there's always time enough to do it over. Or, put another way, better safe than sorry.

Regarding those times when VirusTotal shows 1 or 2 of its many scanning programs reporting an issue, just go by the weight of the evidence. If, for example, the ratio is 67/1, meaning 67 programs show the software is clean and 1 says it isn't, it's highly unlikely that 67 programs are wrong and only one is right, so the 1 is almost certainly a false positive.

Hope that helps.

Thanks Yankiwi, that's the kind of sane practical advice I look for on Forums like this. I don't know how to scan it BEFORE downloading a proggy but my scanner works during the DL and that is what I go by. If one of the engines picks up something, now I can rescan the DLed proggy with Virus Total. Thanks again.

Been using Flux for years. Plenty of settings for me.

Yes, it is a very good software and really very useful, but I really prefer SunsetScreen over it because this one has more options allowing a better fine tuning.

We may find SunsetScreen at this address : http://www.skytopia.com/software/sunsetscreen