11 ms·

f.lux author here, still slogging through the article. It is hard to understand the light levels used because they use "power" (uW, mW) from a laser, and not "i

by herf 8y ago

f.lux author here, still slogging through the article. It is hard to understand the light levels used because they use "power" (uW, mW) from a laser, and not "irradiance" (uW/cm^2 or mW/cm^2), so which area they have concentrated that light over is hard to understand. All I can see is it is from a laser, so the irradiance could be extremely high. The human lens filters most light at the peak of the given spectrum for free retinal (383nm), and so once you get to 450nm like an LED, the hazard data in the visual range is 100x less sensitive, see Fig 1 here: https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1751-1097.2011.00921.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1751-1097.... It bears repeating that computer screens have <5% the hazard-weighted irradiance of a blue sky. (Can't make a direct comparison with lasers.) Not sure the conversion to white light is correct, and it is unclear to me right now if this much retinal is available in vivo.

Forge36 8y ago
I'm running f.lux on my work PC (tones down a bad otherwise VERY bright-blue monitor). Thank you for reading/writing out your interpretation of the article so clearly (highlighting points others are likely to trip on not coming from a related background)
- hinkley 8y ago
  Have we fixed the “optimized for electronics store demo” problem with monitors yet? Part of my ritual of setting up a new monitor is to turn down the brightness and increase the contrast. They almost always default to very bad values. Brightness, temperature and green/blur balance are all off for an office setting. In the worst case the backlight was capable of outputting twice as much light as I really needed.
  - LeoPanthera 8y ago
    Most/all modern monitors have presets, one of which is "store demo". All you've got to do is pick the calibrated preset.
  - userbinator 8y ago
    When I got my first LCD monitor, the first thing I did was turn the brightness down to 0 and the contrast to slightly above; at that point it was already plenty bright enough, and after a few years when I noticed the brightness begin to fade I increased it 2-3 notches. I suspect part of it is also planned obolescence --- when the backlight is running at full brightness, its lifespan is greatly decreased. Now the aforementioned monitor is approaching 15 years of age and brightness has reached 20/100, so there's still plenty of life left in it.
    - Moru 8y ago
      Leds often dim faster when young. Something else will most likely fail before the leds are too dim. On the other hand flickering can be more obvious if you lower brightness of a led. Brightness is usually emulated by turning the led on and off very fast.
taneq 8y ago
Hijacking this for a moment to say thanks for f.lux :) I've been running it for years and it's one of those things where you don't really notice the effect until you turn it off and then EGADS MY EYES.
- erikbye 8y ago
  Windows 10 has this built-in, so does macOS.
  - benrbray 8y ago
    These are relatively new features, and they arguably wouldn't have been added if not for the popularity of flux ;)
    - erikbye 8y ago
      Does that matter? It's built-in now, and that's why I commented. To raise awareness. If built-in features have you covered there is no point going third-party.
      - bradknowles 8y ago
        It's nice that they are there for people who won't install 3rd party software to get the extra features, but f.lux is still better.
      - jakemauer 8y ago
        I understand where you're coming from but they don't have feature parity. Flux allows me to target much lower color temperatures than MacOS' built in "Night Shift" feature. That alone makes Flux worthwhile.
        epmaybe 8y ago
        out of curiosity, how low are you going in terms of temperature?
wpasc 8y ago
Thank you for your input, but I mostly want to thank you for f.lux. It has been one of my favorite things for a long time. It's silly how long it's taken companies to provide a native blue light filter and your product just kicks ass. If you guys ever wanted to figure out your app on a smart TV (or apple TV), I know there'd be a lot of thankful people! Also, I'd love to contribute to the ongoing dev of f.lux (I don't think I've had to pay for it?) How might I?
- tough_luck 8y ago
  For my Samsung TV I use movie mode and also change colour temperature to warm.
  - rapnie 8y ago
    I have the "blue light filter" on by default, on my android mobile. Don't know how effective it is, but it will at least help a bit.
    - exhilaration 8y ago
      On my Google Pixel, this is under Settings > Display > Night Light.
      - daveFNbuck 8y ago
        In Android Pie, it's also one of the 9 shortcuts you get when you pull down from the top twice on your home screen, right next to airplane mode.
- sundvor 8y ago
  Hook your TV up to a computer running f.lux or similar! I've used a HTPC for the past decade and more, wouldn't go back.
- Vesther 8y ago
  Check out the FAQ for a PayPal donation link: https://justgetflux.com/faq.html https://justgetflux.com/faq.html Huge thanks to the author from me as well!
herf 8y ago
If you are curious, the smallest doses where "blue light hazard" has been observed in humans (short-term exposure) are around 10 J/cm^2. International standards use around 2 J/cm^2 for a safety margin. One example of this is hiking in fresh snow for hours, no sunglasses, meaning exposures well above 10,000 cd/m2 to "white light". Computer screens are way dimmer - an hour of iPad use is .0365 J/cm^2. http://www.nature.com/eye/journal/v30/n2/full/eye2015261a.html http://www.nature.com/eye/journal/v30/n2/full/eye2015261a.ht... is a good summary. For long-term exposure (AMD risk) we have very little data, so understanding the mechanisms (such as above article does) can help.
- phyzome 8y ago
  Do those numbers account for pupil dilation?
abledon 8y ago
how does eye color factor into this? I read that objects with certain colors reflect rays of the same wavelength.
sizzle 8y ago
Thank you for many years of f.lux. How would you say it stacks up against Nightshift in iOS and macOS natively?
jensvdh 8y ago
I suffer from chronic photophobia thanks to Uveitis. Flux allowed me to keep my job.
akashaggarwal7 8y ago
Ever since f.lux came into my life, my long screen starring hours have stopped causing me headaches and bad sleep. My phone and my computer have night mode on, all the time! Thank you for f.lux!
zengid 8y ago
f.lux is amazing; thanks for your work!
spaceandshit 8y ago
I'd like to thank you as well. I jailbroke my iPhone just to get flux on there (before Night Shift), and still prefer it over Night Shift.
henvic 8y ago
Hi herf, your software is really nice but one thing that kept me from using it (and adopted since Apple's 'night shift', though I don't use all days) is that I enjoy photography. Probably you heard this a few times, but one thing that I'd love to have is this off for photos (I'd switch from being an eventual user to being a full-time user).
- rakotinci 8y ago
  You can just disable it for an hour. That's what I do at least.
- Moru 8y ago
  I do color sensitive work now and then too. All you need to do is right-click the icon and select "disable while running [active program]". I was very happy when I found f.lux. Finally something replacing my own tool I wrote for my Atari. The main benefits with f.lux is you can easily set brightness and on/off with keys in any program or game, no need to navigate with mouse in menus.
- deleted 8y ago
  [deleted]
fouc 8y ago
I wanted to leave a note for others to keep in mind that f.lux can make the computer screen TOO comfortable to read in the evening. Which can lead to eye strain. I used f.lux for 2 years. I found that I would stay up way past my bedtime, glued to the computer screen, and end up with correspondingly tired & fucked up eyes. So I got rid of f.lux, and after that, I would go to bed at a more proper time. When the screen starts irritating my eyes, it's a direct indication that it's time to close the computer and get the hell to sleep. Ever since that, my eyes have done a lot better, because I no longer push to stay up way past my bed time.
- opan 8y ago
  I also tend to have eye strain if I'm computing very late at night, and take it as a signal to go to bed. I've described this to people, and it seems it doesn't affect everyone. It could also just be that there's a difference in awake time, blink frequency, or some other factor. I'll often go to bed more because my eyes are giving up on me and starting to burn rather than any sort of mental fatigue. I don't always keep normal daylight hours, so read this more as staying awake a long time than something specific to daylight
  - fouc 8y ago
    The pain signals of eye strain doesn't seem to hit right away, so I can keep reading past the point where I really should stop. The pain creeps up gradually but it's really too subtle if I'm stuck on an engaging story. But I don't have that problem if I turn off f.lux, that way my discomfort is more immediate and I stop.
    - nnain 8y ago
      What you described is exactly how I've been feeling for last 3-4 years. The pain signal kicks in the next day, sometimes even a day after. So yeah you can't tell at the time you're working late how the eyes will feel the next days. Sometimes it also triggers a headache and that spoils the whole day. So the only solution I have figured is to be regimented about my screen time. I love working late at night and now have to tell myself to turn the work off. That kinda sucks. Btw, It happened both with my previous laptop with LCD screens and the current LED screen. For a few months I got hooked to Mobile gaming, and that just multiplied the problem! So I drastically cut down on my mobile time and that helps. My mobile had an LCD screen btw; so LED or LCD doesn't seem to be a factor for this particular problem.
ackfoo 8y ago
Also, this was done on cell lines in vitro, only one of which was derived from a non-diseased human retinal epithelium (ARPE-19). Cell lines have undergone genetic change that allows them to replicate indefinitely, so they are fundamentally different from normal cells. I presume that they used a laser because they anticipated that it would potentially take years to see a result from a non-coherent blue light source, far exceeding their available funding, patience, and ability to keep uncontaminated cell cultures going. Applying a blue laser with unknown irradiance to a retinal cell line from a single human genetic source in vitro is very, very far from proving a link between blue light and diseases such as macular degeneration and RP. All this demonstrates is that coherent blue light is capable, under certain circumstances, of interacting with retinal to produce cell damage. Any relationship to human disease on the basis of this paper is pure speculation. Advising people to wear "blue blocker" sunglasses or avoid cellphone screens (or take Vitamin E!) is pure fantasy made up by the scientific press to sell your retinas.
- refurb 8y ago
  Great analysis of the paper’s experimental protocol. Isn’t the other “sniff test” that we haven’t seen a huge increase in age related retinal diseases since the introduction of computer monitor and handheld devices? If these sources had such a big impact, it would be obvious from incidence numbers.
  - ALee 8y ago
    The problem with this is that the desktop computer being widely used is probably the late 1990s (and we should be isolating for screens that emitted the white light/blue light mentioned. Assuming that it takes daily exposure over a number of years say 20 years, we should probably start seeing that within the next 5-10 years from tech industry workers. It may be as severe as tobacco or as benign as fluoride, we'll see early indications, but we won't know until much later. I think everyone just likes it when it feels better for your eyes to filter out blue light.
no_identd 8y ago
Hey since I have you here, please, can you add support for proper color calibration, profiling & characterization to f.lux? Or at least outline in more detail how f.lux handles color profiles? I wouldn't mind having to create multiple display profiles for this, but right now, flux seems to only support non-LUT based, Matrix based calibrations and only if they have VCGT headers, and then only based on those headers. But this seems highly problematic. Take a look at this page here for why: https://argyllcms.com/doc/calvschar.html https://argyllcms.com/doc/calvschar.html I assume you based the current mechanics of f.lux when it comes to handling color profiles based on what the quickgamma homepage says about this: https://quickgamma.de/indexen.html https://quickgamma.de/indexen.html To quote: "[...] Apple has been using the LUT since many years for its operating system built in color management. In fact, Apple has registered the private ICC Profile tag video card gamma table (vcgt) with the International Color Consortium (ICC). This tag is used in a dedicated Monitor Profile and holds the gamma values, which are then loaded into the LUT by a loader program. Hardware based Monitor Calibration Systems also use the vcgt tag, which in this case contains the correction data to achieve the monitor calibration. Because Windows did not provide a LUT loader, each calibration program had to provide its own LUT loader program. ... [...] Things changed when Windows 7 came along and provided its built in calibration loader, which not only loads the LUT at system start up, but also takes care of Standby and Hibernate. [...]" As you might notice, the two stories from those pages seem to conflict? Right now, when I use Windows to load my icc profile, I get correct colors. Same if I use the DisplayCAL profile loader. However, if I start f.lux during the day (where f.lux shouldn't mess with the colors at all) I get semi-incorrect colors - they end up "more correct" than when I have no color profile loaded at all, but still VERY incorrect.
- jonhendry18 8y ago
  Surely you don't expect color profiles to work when f.lux is operating? I'm not sure what the point would be for color profiles when you're explicitly opting for distorted color reproduction with f.lux. Is what you want more like "don't mess with the operation of color profiles when f.lux is disabled or otherwise shouldn't be adjusting the screen?"
  - 8y ago
ALee 8y ago
Herf - it would be great if you guys could have an official position on this paper and to really help us understand what flux is doing or not doing. I tend to see you folks as the vanguard pushing the bigger tech companies to adopt your technology - I for one tell EVERYONE to download Flux.

by herf 8y ago

Forge36 8y ago

I'm running f.lux on my work PC (tones down a bad otherwise VERY bright-blue monitor). Thank you for reading/writing out your interpretation of the article so clearly (highlighting points others are likely to trip on not coming from a related background)

hinkley 8y ago
Have we fixed the “optimized for electronics store demo” problem with monitors yet? Part of my ritual of setting up a new monitor is to turn down the brightness and increase the contrast. They almost always default to very bad values. Brightness, temperature and green/blur balance are all off for an office setting. In the worst case the backlight was capable of outputting twice as much light as I really needed.
- LeoPanthera 8y ago
  Most/all modern monitors have presets, one of which is "store demo". All you've got to do is pick the calibrated preset.
- userbinator 8y ago
  When I got my first LCD monitor, the first thing I did was turn the brightness down to 0 and the contrast to slightly above; at that point it was already plenty bright enough, and after a few years when I noticed the brightness begin to fade I increased it 2-3 notches. I suspect part of it is also planned obolescence --- when the backlight is running at full brightness, its lifespan is greatly decreased. Now the aforementioned monitor is approaching 15 years of age and brightness has reached 20/100, so there's still plenty of life left in it.
  - Moru 8y ago
    Leds often dim faster when young. Something else will most likely fail before the leds are too dim. On the other hand flickering can be more obvious if you lower brightness of a led. Brightness is usually emulated by turning the led on and off very fast.

taneq 8y ago

Hijacking this for a moment to say thanks for f.lux :) I've been running it for years and it's one of those things where you don't really notice the effect until you turn it off and then EGADS MY EYES.

erikbye 8y ago
Windows 10 has this built-in, so does macOS.
- benrbray 8y ago
  These are relatively new features, and they arguably wouldn't have been added if not for the popularity of flux ;)
  - erikbye 8y ago
    Does that matter? It's built-in now, and that's why I commented. To raise awareness. If built-in features have you covered there is no point going third-party.
    - bradknowles 8y ago
      It's nice that they are there for people who won't install 3rd party software to get the extra features, but f.lux is still better.
    - jakemauer 8y ago
      I understand where you're coming from but they don't have feature parity. Flux allows me to target much lower color temperatures than MacOS' built in "Night Shift" feature. That alone makes Flux worthwhile.
      - epmaybe 8y ago
        out of curiosity, how low are you going in terms of temperature?

wpasc 8y ago

Thank you for your input, but I mostly want to thank you for f.lux. It has been one of my favorite things for a long time. It's silly how long it's taken companies to provide a native blue light filter and your product just kicks ass. If you guys ever wanted to figure out your app on a smart TV (or apple TV), I know there'd be a lot of thankful people! Also, I'd love to contribute to the ongoing dev of f.lux (I don't think I've had to pay for it?) How might I?

tough_luck 8y ago
For my Samsung TV I use movie mode and also change colour temperature to warm.
- rapnie 8y ago
  I have the "blue light filter" on by default, on my android mobile. Don't know how effective it is, but it will at least help a bit.
  - exhilaration 8y ago
    On my Google Pixel, this is under Settings > Display > Night Light.
    - daveFNbuck 8y ago
      In Android Pie, it's also one of the 9 shortcuts you get when you pull down from the top twice on your home screen, right next to airplane mode.
sundvor 8y ago
Hook your TV up to a computer running f.lux or similar! I've used a HTPC for the past decade and more, wouldn't go back.
Vesther 8y ago
Check out the FAQ for a PayPal donation link: https://justgetflux.com/faq.html https://justgetflux.com/faq.html Huge thanks to the author from me as well!

herf 8y ago

If you are curious, the smallest doses where "blue light hazard" has been observed in humans (short-term exposure) are around 10 J/cm^2. International standards use around 2 J/cm^2 for a safety margin. One example of this is hiking in fresh snow for hours, no sunglasses, meaning exposures well above 10,000 cd/m2 to "white light". Computer screens are way dimmer - an hour of iPad use is .0365 J/cm^2. http://www.nature.com/eye/journal/v30/n2/full/eye2015261a.html http://www.nature.com/eye/journal/v30/n2/full/eye2015261a.ht... is a good summary. For long-term exposure (AMD risk) we have very little data, so understanding the mechanisms (such as above article does) can help.

phyzome 8y ago
Do those numbers account for pupil dilation?

abledon 8y ago

how does eye color factor into this? I read that objects with certain colors reflect rays of the same wavelength.

sizzle 8y ago

Thank you for many years of f.lux. How would you say it stacks up against Nightshift in iOS and macOS natively?

jensvdh 8y ago

I suffer from chronic photophobia thanks to Uveitis. Flux allowed me to keep my job.

akashaggarwal7 8y ago

Ever since f.lux came into my life, my long screen starring hours have stopped causing me headaches and bad sleep. My phone and my computer have night mode on, all the time! Thank you for f.lux!

zengid 8y ago

f.lux is amazing; thanks for your work!

spaceandshit 8y ago

I'd like to thank you as well. I jailbroke my iPhone just to get flux on there (before Night Shift), and still prefer it over Night Shift.

henvic 8y ago

Hi herf, your software is really nice but one thing that kept me from using it (and adopted since Apple's 'night shift', though I don't use all days) is that I enjoy photography. Probably you heard this a few times, but one thing that I'd love to have is this off for photos (I'd switch from being an eventual user to being a full-time user).

rakotinci 8y ago
You can just disable it for an hour. That's what I do at least.
Moru 8y ago
I do color sensitive work now and then too. All you need to do is right-click the icon and select "disable while running [active program]". I was very happy when I found f.lux. Finally something replacing my own tool I wrote for my Atari. The main benefits with f.lux is you can easily set brightness and on/off with keys in any program or game, no need to navigate with mouse in menus.
deleted 8y ago
[deleted]

fouc 8y ago

I wanted to leave a note for others to keep in mind that f.lux can make the computer screen TOO comfortable to read in the evening. Which can lead to eye strain. I used f.lux for 2 years. I found that I would stay up way past my bedtime, glued to the computer screen, and end up with correspondingly tired & fucked up eyes. So I got rid of f.lux, and after that, I would go to bed at a more proper time. When the screen starts irritating my eyes, it's a direct indication that it's time to close the computer and get the hell to sleep. Ever since that, my eyes have done a lot better, because I no longer push to stay up way past my bed time.

opan 8y ago
I also tend to have eye strain if I'm computing very late at night, and take it as a signal to go to bed. I've described this to people, and it seems it doesn't affect everyone. It could also just be that there's a difference in awake time, blink frequency, or some other factor. I'll often go to bed more because my eyes are giving up on me and starting to burn rather than any sort of mental fatigue. I don't always keep normal daylight hours, so read this more as staying awake a long time than something specific to daylight
- fouc 8y ago
  The pain signals of eye strain doesn't seem to hit right away, so I can keep reading past the point where I really should stop. The pain creeps up gradually but it's really too subtle if I'm stuck on an engaging story. But I don't have that problem if I turn off f.lux, that way my discomfort is more immediate and I stop.
  - nnain 8y ago
    What you described is exactly how I've been feeling for last 3-4 years. The pain signal kicks in the next day, sometimes even a day after. So yeah you can't tell at the time you're working late how the eyes will feel the next days. Sometimes it also triggers a headache and that spoils the whole day. So the only solution I have figured is to be regimented about my screen time. I love working late at night and now have to tell myself to turn the work off. That kinda sucks. Btw, It happened both with my previous laptop with LCD screens and the current LED screen. For a few months I got hooked to Mobile gaming, and that just multiplied the problem! So I drastically cut down on my mobile time and that helps. My mobile had an LCD screen btw; so LED or LCD doesn't seem to be a factor for this particular problem.

ackfoo 8y ago

Also, this was done on cell lines in vitro, only one of which was derived from a non-diseased human retinal epithelium (ARPE-19). Cell lines have undergone genetic change that allows them to replicate indefinitely, so they are fundamentally different from normal cells. I presume that they used a laser because they anticipated that it would potentially take years to see a result from a non-coherent blue light source, far exceeding their available funding, patience, and ability to keep uncontaminated cell cultures going. Applying a blue laser with unknown irradiance to a retinal cell line from a single human genetic source in vitro is very, very far from proving a link between blue light and diseases such as macular degeneration and RP. All this demonstrates is that coherent blue light is capable, under certain circumstances, of interacting with retinal to produce cell damage. Any relationship to human disease on the basis of this paper is pure speculation. Advising people to wear "blue blocker" sunglasses or avoid cellphone screens (or take Vitamin E!) is pure fantasy made up by the scientific press to sell your retinas.

refurb 8y ago
Great analysis of the paper’s experimental protocol. Isn’t the other “sniff test” that we haven’t seen a huge increase in age related retinal diseases since the introduction of computer monitor and handheld devices? If these sources had such a big impact, it would be obvious from incidence numbers.
- ALee 8y ago
  The problem with this is that the desktop computer being widely used is probably the late 1990s (and we should be isolating for screens that emitted the white light/blue light mentioned. Assuming that it takes daily exposure over a number of years say 20 years, we should probably start seeing that within the next 5-10 years from tech industry workers. It may be as severe as tobacco or as benign as fluoride, we'll see early indications, but we won't know until much later. I think everyone just likes it when it feels better for your eyes to filter out blue light.

no_identd 8y ago

Hey since I have you here, please, can you add support for proper color calibration, profiling & characterization to f.lux? Or at least outline in more detail how f.lux handles color profiles? I wouldn't mind having to create multiple display profiles for this, but right now, flux seems to only support non-LUT based, Matrix based calibrations and only if they have VCGT headers, and then only based on those headers. But this seems highly problematic. Take a look at this page here for why: https://argyllcms.com/doc/calvschar.html https://argyllcms.com/doc/calvschar.html I assume you based the current mechanics of f.lux when it comes to handling color profiles based on what the quickgamma homepage says about this: https://quickgamma.de/indexen.html https://quickgamma.de/indexen.html To quote: "[...] Apple has been using the LUT since many years for its operating system built in color management. In fact, Apple has registered the private ICC Profile tag video card gamma table (vcgt) with the International Color Consortium (ICC). This tag is used in a dedicated Monitor Profile and holds the gamma values, which are then loaded into the LUT by a loader program. Hardware based Monitor Calibration Systems also use the vcgt tag, which in this case contains the correction data to achieve the monitor calibration. Because Windows did not provide a LUT loader, each calibration program had to provide its own LUT loader program. ... [...] Things changed when Windows 7 came along and provided its built in calibration loader, which not only loads the LUT at system start up, but also takes care of Standby and Hibernate. [...]" As you might notice, the two stories from those pages seem to conflict? Right now, when I use Windows to load my icc profile, I get correct colors. Same if I use the DisplayCAL profile loader. However, if I start f.lux during the day (where f.lux shouldn't mess with the colors at all) I get semi-incorrect colors - they end up "more correct" than when I have no color profile loaded at all, but still VERY incorrect.

jonhendry18 8y ago
Surely you don't expect color profiles to work when f.lux is operating? I'm not sure what the point would be for color profiles when you're explicitly opting for distorted color reproduction with f.lux. Is what you want more like "don't mess with the operation of color profiles when f.lux is disabled or otherwise shouldn't be adjusting the screen?"
- 8y ago

ALee 8y ago

Herf - it would be great if you guys could have an official position on this paper and to really help us understand what flux is doing or not doing. I tend to see you folks as the vanguard pushing the bigger tech companies to adopt your technology - I for one tell EVERYONE to download Flux.