7 ms·

(Michael from f.lux): this kind of thing is necessary for most buildings, because otherwise people don't get a "day" signal when they spend time indoors. Most o

by herf 7y ago

(Michael from f.lux): this kind of thing is necessary for most buildings, because otherwise people don't get a "day" signal when they spend time indoors. Most of us spend >90% of our time inside. However, we shouldn't mess with light levels like these (or even somewhat lower ones) without some limits, and the main one is some automatic timing to turn things down after it gets too late. Otherwise you will find yourself staying at work later and later each day, and it's no accident. Our clocks don't work that well with more than about a 14-15 hour photoperiod ("day"), so spending 18 hours under 5000 lux will screw up your overall rhythms, making your internal day longer than 24 hours and reducing your sleep. This is considerably worse if you're a natural night owl - it will make you later, faster. The myth of electric lighting is that we can live in a permanent summer and turn the wintertime into summer, but there are important seasonal questions that we should think about too. For instance, cancer progresses much faster in summer than in winter [edit: cancer progresses much faster in constant light: winter vs. summer is complicated], and the winter schedule even engages a different part of the central clock in your brain than the summer schedule does. There are some important things going on here, which we've mostly tried to remove from our environments. Knowing how the body works and having the capability to change it really do need to evolve in parallel - I think there is way more capability than knowledge right now.

cracker_jacks 7y ago
> cancer progresses much faster in summer than in winter Can you point me to a reference for this? This pattern is surprising and I would like to learn more about this.
- herf 7y ago
  I think the seasonality data may be mixed, with more diagnoses in the fall and spring in human subjects studies. This particular claim was a hypothesis from Richard Stevens, with some experimental work that shows rapid cancer growth under constant light (in human tumors implanted in mice) by Blask (2002, 2005): http://www.nel.edu/userfiles/articlesnew/NEL230802A03.pdf http://www.nel.edu/userfiles/articlesnew/NEL230802A03.pdf The main mechanism in the Blask work is thought to be suppression of melatonin.
  - msamwald 7y ago
    The rat study you cite here is certainly far from sufficient evidence to make such bold claims or implicated that indoor lighting can promote cancer development in humans! I think you should edit your statement in the top comment further to make it clear that you are not referring to any solid human data here at all.
keenmaster 7y ago
Hey Michael, first off I love f.lux and use it every day. I have a question relating to your comment: is there any reason not to have an extremely high lumen smart light fixture which progressively dims throughout the day and syncs with the solar cycle in the user’s area? That seems like the holy grail, and is simply a combination of Philip’s Hue/LIFX tech and the bulb in the OP.
- herf 7y ago
  Yes, I think that's right - we have 20,000 lumens in our office and it is pretty cool, except you can't see your screen when it's up all the way. I still prefer daylighting, because it changes the angle of the light and everything else through the day. A couple things: I don't think you necessarily need more light in the morning if you have a well-defined (artificial or real) sunset, and if you've reduced light at night to a lower level. We add light to the morning so that we can add as much light as we want at night - the two cancel out. But I think it would be better to really try to design the evening to look different than the workday. Lights should change, and they mostly don't. There are for sure some people with long internal clocks (DSPD/N24) who need very custom lighting schedules to have a normal schedule, but I think if we make the overall signal stronger (more day to night contrast), a lot of the differences between night owls and early birds would become smaller.
  - edoo 7y ago
    They are using these underground to help simulate the true daylight experience. Basically a smart led version of a traditional roof sunlight: https://www.youtube.com/watch?v=aJ4TJ4-kkDw https://www.youtube.com/watch?v=aJ4TJ4-kkDw
    - keenmaster 7y ago
      Wow. It’s hard to believe that’s real.
  - rsync 7y ago
    "Yes, I think that's right - we have 20,000 lumens in our office and it is pretty cool, except you can't see your screen when it's up all the way." Can you elaborate ? 20k lumens doesn't seem like that much ... I see residential interior decorating guidelines at about 20 lumens per square foot for non-intense areas like living rooms[1], etc., which implies a 1000 sf office (smallish) conservatively lit with 20k lumens. I just put 11k lumens of background lighting in a 400sf living room and I am worried it's a bit under-lit, given 12 foot ceilings. I think that perhaps you are talking about something different than I think you are ? [1] As opposed to kitchens where I see 50-80 lumens per square foot recommended...
kaibee 7y ago
> cancer progresses much faster in summer than in winter This sounds fascinating. Do you have a source? Btw, I love f.lux and have been using it since probably like 2010, possibly earlier. Its basically the first thing I install on any computer.
- herf 7y ago
  I made a note about Blask's 2005 work below, which is the main work I was thinking about. We can say that constant light is bad for cancer. But as I'm refreshing my memory, winter can cut both ways. For some, it makes more darkness and more melatonin (which is thought to be protective of cancer). For others, winter results in not seeing enough light, and so melatonin amplitude goes down. And so this is associated with increased cancer.
  - hvidgaard 7y ago
    My immediate thought is that is very closely related to sleep.
- gewa 7y ago
  These are pretty bold claims. I'm not sure if a single communication from 15 years ago is enough to to build such a relationship. Please note, that any claims about "cancer" in general are hard to make, because they have such variety of phenotypes.
Wowfunhappy 7y ago
Do people in e.g. the arctic have these problems during the summer, when the sun never sets?
- herf 7y ago
  A lot of them have very strict routines about going inside and using super-dark curtains at particular times. I've gotten to email some people above 60N and it is just what they do. In the old Aschoff "bunker" studies where people allowed to keep the lights on as long as they wished, they concluded the human clock was 25.1 hours. We know this isn't true if you provide a proper light-dark cycle, it's much closer to 24. But I treat this old work as a cautionary tale - we can be 25.1 hour animals if we leave the lights on all the time.
  - avar 7y ago
    I grew up at 66N (Northern Iceland), for what it's worth blackout curtains are rare to nonexistent there in my experience. Sometimes bedroom curtains don't even cover the whole window, and during parts of the year it's daylight outside 24/7. When I've traveled there with foreigners who grew up at more southern latitudes with year-round "normal" day/night cycles I've sometimes had to tape black trash bags to the bedroom windows for their benefit. What do the locals do? We simply get used to sleeping in daylight. One way of doing that is getting used to sleeping on your back with one of your arms across across your face and over your eyes (such that your elbow is between your eyes/on your forehead and the back of your palm touches or is near the opposite shoulder). I still sleep like that out of habit at more southern latitudes out of habit, and a quick poll among some fellow Icelandic expats where I live when this came up the other day revealed that they do too.
    - Al-Khwarizmi 7y ago
      In Spain we have lots of problems and room for improvement in many issues, but one thing I can be proud of is that the vast majority of homes have blinds that close completely and get zero light in. I often wonder why it isn't like this elsewhere, and especially in northern places where it would be especially convenient (I get that it's possible to adapt, but wouldn't it be nicer to be able to sleep in any position?) Of course, the problem with this is that I'm totally spoiled and when I travel abroad (1), I can almost never sleep well. Hotel rooms in most countries have blackout curtains but if you're used to Spanish blinds, even those let a lot of light in from the edges. And don't get me started about LEDs... (1) PS: Now that I come to think of it, I don't sleep well when I travel within Spain either... curiously, people's homes have blinds but hotels typically don't.
rajbot 7y ago
Have you considered manufacturing f.lux for home lighting, such as a wall-mounted controller for Hue or Ikea bulbs that changes color spectrum depending on time of day? Or possibly bulbs with f.lux build in, so no external controller is required?
- herf 7y ago
  Yes, we were looking at this quite a while ago. Lighting is a really hard business (especially residential) so we did not make the leap, and mainly have tried so far to work with people who are in that business. We thought back then that some form of "smart lighting" would be universal. This mostly hasn't happened, so the truth is that the opportunity is different than we had guessed. Today most "smart" replacement lamps are $20+, similar to several years ago, even though normal lamps are $1. We do support a lot of integrations with f.lux on Windows, so people can use f.lux with their Hue/LIFX/yeelight/etc., but it is somewhere <2% of our users right now.
  - posedge 7y ago
    Out of curiosity, what makes lighting such a hard business? I have given the issue some thought as well. f.lux integration with Hue is great, but unfortunately not a solution for me, as I'd have to keep my windows pc running all day.
    - Hackbraten 7y ago
      There are apps, such as iConnectHue, which are able to install a preset on the Hue Bridge that dims the lights or changes the color temperature without needing any computer or phone turned on when the timer fires.
    - maxerickson 7y ago
      Fixture design is fashion and existing products are not expensive.
    - nicoburns 7y ago
      The fact that bulbs are 1. small and 2. run on mains electricity is a big complicating factor. By far the easiest way to build this would be with dual-colour LED strips. But that's not how most people want to light their homes.
deleted 7y ago
[deleted]
aex 7y ago
> Our clocks don't work that well with more than about a 14-15 hour photoperiod ("day") Regarding only natural light, what would be the ideal latitude region for psychology year-round? At 30°N and 30°S days swing between 10 hours to 14 hours through a year. Would it be ideal to live in between 30°N and 30°S, or would you expand/shrink the range? ps. Any resources on geography-psychology relationships would be appreciated.
- herf 7y ago
  SAD and cancer rates go up somewhat with latitude, definitely by 35-40N. But it is complicated because it doesn't affect everyone the same way. e.g., most of Europe is living above 40N. In some cases, availability of natural light (due to tree cover, weather, and position in timezone) is as important as latitude. I would guess that some people are simply better at living at more extreme latitudes or with a weaker circadian signal. Several researchers have tried to use particular genetic markers to explain this, but I don't know a specific one that explains all of it.
mosselman 7y ago
Are there any lamp brands you can recommend that allow me to set the bulb temperature, but that don't require an internet connected hub and app on my phone? So RF or something.
- iainmerrick 7y ago
  I believe IKEA's smart bulbs are local only, not internet connected: https://www.ikea.com/us/en/cat/smart-lighting-36812/ https://www.ikea.com/us/en/cat/smart-lighting-36812/ (I've been meaning to try them out but haven't done so yet, so I can't vouch for the quality in detail. Their stuff is usually solidly mid-range and very good value for money, though.)
  - mosselman 7y ago
    Thanks for the tip. I am a big IKEA fan, their value for money is, as you say, good in general.
donmatito 7y ago
Thank you for f.lux, I enjoy coming home early, being with my family then working later in the night. Having f.lux installed on my computer has improved my quality of sleep tremendously However to tie it to the article : do you know of the variability between individuals of lighting effect on morale ? I know a lot of people getting depressed when winter comes, but it has 0 effect on me
Angostura 7y ago
Is there any solid peer-reviewed, published papers on this stuff? While it sounds intuitively correct and attractive, I've struggled to find anything rigorous that shows light colour and intensity in the evening has an effect of sleep quality - its all anecdotal.
- wainstead 7y ago
  Second this, and I wonder how people who live near the equator respond to seasons and light vs. people closer to the Arctic circle.
  - Broken_Hippo 7y ago
    Very much this. I live in Norway. While I'm below the Arctic circle, summer nights are bright. I don't need outdoor lighting to read as the sun goes juuuust below the horizon. This time of year, days are short and the light intensity never really gets all that bright. I don't have issues with any of it - and I'm an immigrant.
    - keenmaster 7y ago
      There are many genetic differences, even within a given ethnicity, concerning sleep. What may impair sleep for one individual may have no effect for another. This variation may have been beneficial from an evolutionary standpoint, because variable sleep schedules meant that someone in a given community could always respond to threats.
- throw0101a 7y ago
  The general field of study is called chronobiology. Doing a search for "chronobiology light sleep" gives all sorts of results. One example: > Environmental light synchronizes the primary mammalian biological clock in the suprachiasmatic nuclei, as well as many peripheral clocks in tissues and cells, to the solar 24-hour day. Light is the strongest synchronizing agent (zeitgeber) for the circadian system, and therefore keeps most biological and psychological rhythms internally synchronized, which is important for optimum function. Circadian sleep-wake disruptions and chronic circadian misalignment, as often observed in psychiatric and neurodegenerative illness, can be treated with light therapy. The beneficial effect on circadian synchronization, sleep quality, mood, and cognitive performance depends on timing, intensity, and spectral composition of light exposure. Tailoring and optimizing indoor lighting conditions may be an approach to improve wellbeing, alertness, and cognitive performance and, in the long term, producing health benefits. * https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3553574/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3553574/ There are 61 foot notes in the above paper, so that should help you get starting going down this rabbit hole. :)
benkuhn 7y ago
Hey Michael, thanks for commenting! (And thanks for making f.lux which I've found incredibly useful for years!) I strongly agree that it's important to change light levels throughout the day; it's very obvious that bulbs this bright suppress my sleepiness. I should probably add this to the post's FAQ so that people don't do anything irresponsible. I do think that some people might get a mistaken impression of how strong the evidence is when you claim that "cancer progresses much faster in constant light" without citing or caveating that this is based on one study, in rats, where the treatment shone a light on them for a full 24 hours.
WhompingWindows 7y ago
I love f.lux and I've used it for years, however I have to bring up the one feature I dislike...the "alarm clock" type feature which supposedly could be turned off by an option, but in reality there was no option to turn it off. I was able to turn it off on one computer but not the other, both windows OS!

by herf 7y ago

cracker_jacks 7y ago

> cancer progresses much faster in summer than in winter Can you point me to a reference for this? This pattern is surprising and I would like to learn more about this.

herf 7y ago
I think the seasonality data may be mixed, with more diagnoses in the fall and spring in human subjects studies. This particular claim was a hypothesis from Richard Stevens, with some experimental work that shows rapid cancer growth under constant light (in human tumors implanted in mice) by Blask (2002, 2005): http://www.nel.edu/userfiles/articlesnew/NEL230802A03.pdf http://www.nel.edu/userfiles/articlesnew/NEL230802A03.pdf The main mechanism in the Blask work is thought to be suppression of melatonin.
- msamwald 7y ago
  The rat study you cite here is certainly far from sufficient evidence to make such bold claims or implicated that indoor lighting can promote cancer development in humans! I think you should edit your statement in the top comment further to make it clear that you are not referring to any solid human data here at all.

keenmaster 7y ago

Hey Michael, first off I love f.lux and use it every day. I have a question relating to your comment: is there any reason not to have an extremely high lumen smart light fixture which progressively dims throughout the day and syncs with the solar cycle in the user’s area? That seems like the holy grail, and is simply a combination of Philip’s Hue/LIFX tech and the bulb in the OP.

herf 7y ago
Yes, I think that's right - we have 20,000 lumens in our office and it is pretty cool, except you can't see your screen when it's up all the way. I still prefer daylighting, because it changes the angle of the light and everything else through the day. A couple things: I don't think you necessarily need more light in the morning if you have a well-defined (artificial or real) sunset, and if you've reduced light at night to a lower level. We add light to the morning so that we can add as much light as we want at night - the two cancel out. But I think it would be better to really try to design the evening to look different than the workday. Lights should change, and they mostly don't. There are for sure some people with long internal clocks (DSPD/N24) who need very custom lighting schedules to have a normal schedule, but I think if we make the overall signal stronger (more day to night contrast), a lot of the differences between night owls and early birds would become smaller.
- edoo 7y ago
  They are using these underground to help simulate the true daylight experience. Basically a smart led version of a traditional roof sunlight: https://www.youtube.com/watch?v=aJ4TJ4-kkDw https://www.youtube.com/watch?v=aJ4TJ4-kkDw
  - keenmaster 7y ago
    Wow. It’s hard to believe that’s real.
- rsync 7y ago
  "Yes, I think that's right - we have 20,000 lumens in our office and it is pretty cool, except you can't see your screen when it's up all the way." Can you elaborate ? 20k lumens doesn't seem like that much ... I see residential interior decorating guidelines at about 20 lumens per square foot for non-intense areas like living rooms[1], etc., which implies a 1000 sf office (smallish) conservatively lit with 20k lumens. I just put 11k lumens of background lighting in a 400sf living room and I am worried it's a bit under-lit, given 12 foot ceilings. I think that perhaps you are talking about something different than I think you are ? [1] As opposed to kitchens where I see 50-80 lumens per square foot recommended...

kaibee 7y ago

> cancer progresses much faster in summer than in winter This sounds fascinating. Do you have a source? Btw, I love f.lux and have been using it since probably like 2010, possibly earlier. Its basically the first thing I install on any computer.

herf 7y ago
I made a note about Blask's 2005 work below, which is the main work I was thinking about. We can say that constant light is bad for cancer. But as I'm refreshing my memory, winter can cut both ways. For some, it makes more darkness and more melatonin (which is thought to be protective of cancer). For others, winter results in not seeing enough light, and so melatonin amplitude goes down. And so this is associated with increased cancer.
- hvidgaard 7y ago
  My immediate thought is that is very closely related to sleep.
gewa 7y ago
These are pretty bold claims. I'm not sure if a single communication from 15 years ago is enough to to build such a relationship. Please note, that any claims about "cancer" in general are hard to make, because they have such variety of phenotypes.

Wowfunhappy 7y ago

Do people in e.g. the arctic have these problems during the summer, when the sun never sets?

herf 7y ago
A lot of them have very strict routines about going inside and using super-dark curtains at particular times. I've gotten to email some people above 60N and it is just what they do. In the old Aschoff "bunker" studies where people allowed to keep the lights on as long as they wished, they concluded the human clock was 25.1 hours. We know this isn't true if you provide a proper light-dark cycle, it's much closer to 24. But I treat this old work as a cautionary tale - we can be 25.1 hour animals if we leave the lights on all the time.
- avar 7y ago
  I grew up at 66N (Northern Iceland), for what it's worth blackout curtains are rare to nonexistent there in my experience. Sometimes bedroom curtains don't even cover the whole window, and during parts of the year it's daylight outside 24/7. When I've traveled there with foreigners who grew up at more southern latitudes with year-round "normal" day/night cycles I've sometimes had to tape black trash bags to the bedroom windows for their benefit. What do the locals do? We simply get used to sleeping in daylight. One way of doing that is getting used to sleeping on your back with one of your arms across across your face and over your eyes (such that your elbow is between your eyes/on your forehead and the back of your palm touches or is near the opposite shoulder). I still sleep like that out of habit at more southern latitudes out of habit, and a quick poll among some fellow Icelandic expats where I live when this came up the other day revealed that they do too.
  - Al-Khwarizmi 7y ago
    In Spain we have lots of problems and room for improvement in many issues, but one thing I can be proud of is that the vast majority of homes have blinds that close completely and get zero light in. I often wonder why it isn't like this elsewhere, and especially in northern places where it would be especially convenient (I get that it's possible to adapt, but wouldn't it be nicer to be able to sleep in any position?) Of course, the problem with this is that I'm totally spoiled and when I travel abroad (1), I can almost never sleep well. Hotel rooms in most countries have blackout curtains but if you're used to Spanish blinds, even those let a lot of light in from the edges. And don't get me started about LEDs... (1) PS: Now that I come to think of it, I don't sleep well when I travel within Spain either... curiously, people's homes have blinds but hotels typically don't.

rajbot 7y ago

Have you considered manufacturing f.lux for home lighting, such as a wall-mounted controller for Hue or Ikea bulbs that changes color spectrum depending on time of day? Or possibly bulbs with f.lux build in, so no external controller is required?

herf 7y ago
Yes, we were looking at this quite a while ago. Lighting is a really hard business (especially residential) so we did not make the leap, and mainly have tried so far to work with people who are in that business. We thought back then that some form of "smart lighting" would be universal. This mostly hasn't happened, so the truth is that the opportunity is different than we had guessed. Today most "smart" replacement lamps are $20+, similar to several years ago, even though normal lamps are $1. We do support a lot of integrations with f.lux on Windows, so people can use f.lux with their Hue/LIFX/yeelight/etc., but it is somewhere <2% of our users right now.
- posedge 7y ago
  Out of curiosity, what makes lighting such a hard business? I have given the issue some thought as well. f.lux integration with Hue is great, but unfortunately not a solution for me, as I'd have to keep my windows pc running all day.
  - Hackbraten 7y ago
    There are apps, such as iConnectHue, which are able to install a preset on the Hue Bridge that dims the lights or changes the color temperature without needing any computer or phone turned on when the timer fires.
  - maxerickson 7y ago
    Fixture design is fashion and existing products are not expensive.
  - nicoburns 7y ago
    The fact that bulbs are 1. small and 2. run on mains electricity is a big complicating factor. By far the easiest way to build this would be with dual-colour LED strips. But that's not how most people want to light their homes.

deleted 7y ago

[deleted]

aex 7y ago

> Our clocks don't work that well with more than about a 14-15 hour photoperiod ("day") Regarding only natural light, what would be the ideal latitude region for psychology year-round? At 30°N and 30°S days swing between 10 hours to 14 hours through a year. Would it be ideal to live in between 30°N and 30°S, or would you expand/shrink the range? ps. Any resources on geography-psychology relationships would be appreciated.

herf 7y ago
SAD and cancer rates go up somewhat with latitude, definitely by 35-40N. But it is complicated because it doesn't affect everyone the same way. e.g., most of Europe is living above 40N. In some cases, availability of natural light (due to tree cover, weather, and position in timezone) is as important as latitude. I would guess that some people are simply better at living at more extreme latitudes or with a weaker circadian signal. Several researchers have tried to use particular genetic markers to explain this, but I don't know a specific one that explains all of it.

mosselman 7y ago

Are there any lamp brands you can recommend that allow me to set the bulb temperature, but that don't require an internet connected hub and app on my phone? So RF or something.

iainmerrick 7y ago
I believe IKEA's smart bulbs are local only, not internet connected: https://www.ikea.com/us/en/cat/smart-lighting-36812/ https://www.ikea.com/us/en/cat/smart-lighting-36812/ (I've been meaning to try them out but haven't done so yet, so I can't vouch for the quality in detail. Their stuff is usually solidly mid-range and very good value for money, though.)
- mosselman 7y ago
  Thanks for the tip. I am a big IKEA fan, their value for money is, as you say, good in general.

donmatito 7y ago

Thank you for f.lux, I enjoy coming home early, being with my family then working later in the night. Having f.lux installed on my computer has improved my quality of sleep tremendously However to tie it to the article : do you know of the variability between individuals of lighting effect on morale ? I know a lot of people getting depressed when winter comes, but it has 0 effect on me

Angostura 7y ago

Is there any solid peer-reviewed, published papers on this stuff? While it sounds intuitively correct and attractive, I've struggled to find anything rigorous that shows light colour and intensity in the evening has an effect of sleep quality - its all anecdotal.

wainstead 7y ago
Second this, and I wonder how people who live near the equator respond to seasons and light vs. people closer to the Arctic circle.
- Broken_Hippo 7y ago
  Very much this. I live in Norway. While I'm below the Arctic circle, summer nights are bright. I don't need outdoor lighting to read as the sun goes juuuust below the horizon. This time of year, days are short and the light intensity never really gets all that bright. I don't have issues with any of it - and I'm an immigrant.
  - keenmaster 7y ago
    There are many genetic differences, even within a given ethnicity, concerning sleep. What may impair sleep for one individual may have no effect for another. This variation may have been beneficial from an evolutionary standpoint, because variable sleep schedules meant that someone in a given community could always respond to threats.
throw0101a 7y ago
The general field of study is called chronobiology. Doing a search for "chronobiology light sleep" gives all sorts of results. One example: > Environmental light synchronizes the primary mammalian biological clock in the suprachiasmatic nuclei, as well as many peripheral clocks in tissues and cells, to the solar 24-hour day. Light is the strongest synchronizing agent (zeitgeber) for the circadian system, and therefore keeps most biological and psychological rhythms internally synchronized, which is important for optimum function. Circadian sleep-wake disruptions and chronic circadian misalignment, as often observed in psychiatric and neurodegenerative illness, can be treated with light therapy. The beneficial effect on circadian synchronization, sleep quality, mood, and cognitive performance depends on timing, intensity, and spectral composition of light exposure. Tailoring and optimizing indoor lighting conditions may be an approach to improve wellbeing, alertness, and cognitive performance and, in the long term, producing health benefits. * https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3553574/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3553574/ There are 61 foot notes in the above paper, so that should help you get starting going down this rabbit hole. :)

benkuhn 7y ago

Hey Michael, thanks for commenting! (And thanks for making f.lux which I've found incredibly useful for years!) I strongly agree that it's important to change light levels throughout the day; it's very obvious that bulbs this bright suppress my sleepiness. I should probably add this to the post's FAQ so that people don't do anything irresponsible. I do think that some people might get a mistaken impression of how strong the evidence is when you claim that "cancer progresses much faster in constant light" without citing or caveating that this is based on one study, in rats, where the treatment shone a light on them for a full 24 hours.

WhompingWindows 7y ago

I love f.lux and I've used it for years, however I have to bring up the one feature I dislike...the "alarm clock" type feature which supposedly could be turned off by an option, but in reality there was no option to turn it off. I was able to turn it off on one computer but not the other, both windows OS!