A lot of people think that sleep and circadian rhythms are nearly the same thing, but this isn't really true. But there are a lot of other circadian systems in the body, and they can become compromised if you spend all your time as if it's the longest day of the year - e.g., melatonin duration in the blood will expand to use 12 hours during the winter (even if you're not sleeping that long), and melatonin is also pretty good at fighting cancer.

There aren't so many places on the planet where people have 16 hours of bright sunlight, and there are none of them that do this year-round.

We think most people are "darkness deprived" - so a healthy pattern of light includes seeing some lower light levels, even when it's not right before bedtime. We also think that lowering the light several hours before bedtime can help people align with their day, but individuals vary a lot in this.

Overall this is an area we are putting a lot of work into right now - both in showing that this idea is the right thing to do, and in making it more flexible.

The main reports are ICNIRP and IEC62471 - they define a blue light hazard spectrum. The landmark papers include Ham 1976. Before that we didn't know that "blue light" would be the most sensitive part of the spectrum for a retina.

Ratnayake did not measure irradiance--that is, they measured total power from a laser, but then the press compared the power in this tiny laser dot as if it had been spread out over a square centimeter. This is just not the same thing! A tiny dot at this power level damages retinal tissue and when it's spread out so it's 10,000x dimmer, it does not.

This looks like a good summary:
https://www.aaopt.org/docs/2018/2018-handouts/go/v1__ses_go-05.pdf

@ibrahimoviczlatan205 said in How to get to 800K on a mac?:

@fluxzeta said in How to get to 800K on a mac?:

I have seen posts saying that it is possible to get under 1200K, the lowest setting on the f.lux sliding bar, by pressing alt+shift+page up/page down. However, Macs do not have the page up/page down key, and when I tried using the alternative on a mac for that key (fn+up arrow/down arrow), that did not seem to work. Does anyone know how to get down to 800K on a mac?
It would probably be correct to assume that the Macintosh SE is not of the FDHD kind, since your question merely refers to 800K floppies.

Unfortunately, it is absolutely necessary to create 800K floppy disks on another older Macintosh computer with a (built-in) floppy drive for 800K (and 1.44 MB) disks. This means a pre-1998 computer.
good luck

They are talking about color temperature. 800 Kelvin.

@herf That's quite interesting, I figured it would be more linear. That's really nice to know looking at a 5500 lux sky during the day whether cloudy or blue will be more than enough to shift my schedule.

One more question, do our eyes need to be open to have a light response (I currently think it doesn't matter)? So if I stare at the sky with my eyes closed, will the schedule shift be the same as with them open?

I think this is an obvious one as if you could close your eyes to block out bright light responses then that would be more discussed.

Last question for this topic (so far anyway); What would be the most accessible (easy to purchase either in store or online) most stimulating indoor light that your aware of? Any style, any base etc, as I would like to replace two lights in a ceiling fan if they'll fit (max size is about a 26w cfl, but the socket will handle two 72w halogens).

I really appreciate all this information as I was thinking I needed over 50,000 lux during noon to really get my schedule in check. It's really nice to know that 1,000 lux early in the morning is plenty. On that note, maybe it's not all about schedule shifting. What about the part where not seeing enough bright light during the day affects how sensitive we will be to light after sundown--is 1-10 thousand lux still enough to mitigate those effects?

Have you tried the blue light blocking light bulbs from Harth? www.harthyourhome.com

Today I am sticking to doing light activities that mostly involve laying down and resting. I made sure to get nutrients and protein in my body to help give me energy to get through the rest of the day without having to nap too often. I am spending time today reading, writing, and taking care of myself..
maybe i will see a doctor

Account closed for spammy spam

If you are looking for the best deal for Roman, Sheer or Bamboo shades, this will be your best option:
https://www.blindsshopper.com/

These guys own a private company, and have incredible attention to detail when it comes to their shades. They are certainly the best.

@tungsten_smooth (Only a year late.)

No. The amount of blue light is that available from the sun/field-lights. The field isn't glowing, adding extra light. The colour of the ground won't change the amount of blue entering your eyes. (Unless it's very white or very dark.) Green or blue of roughly the same brightness shouldn't make any difference.

@jamesc18 Replying eighteen months late, but for the sake of anyone else who stumbles across this...

I change the longitude in f.lux's location setting to a location which matches the time of day I'm actually awake. Then I can set the "earliest wake time" to the actual clock-time I want. Fiddly, but IMO it's better than trying to change your computer clock just for f.lux, and works better than trying to juggle other settlings.

(Note, it's 15 degrees of longitude for every hour. West for later, East for earlier. So if your shift is midnight to 8am, and you want to get up just before work, so you're going to bed at, say, 3 or 4pm; then you want to set you longitude around 120 degrees East of your actual location. Ie, LA is 118deg W, so if you live there you'd want to set location to 2deg East. London is zero degrees, so Londoners would set their location to 120deg East. Sydney is 151 deg East, so there you'd set your location to 89deg West. Then set your earliest wake-up to 11pm or whenever you get up.)

This method also makes it easier if your shift rotates. Work out the longitudes that correspond to each shift, just once, and write them down, then adjust as you need. (You might even get clever and use smaller adjustments during the week before your next shift-change to help you start adjusting in advance.)

A cheaper option than 3M safety glasses are anti-laser glasses from eBay. Red ones (for blue-laser) are also sold as "dental-laser safety glasses". Because of what they are used for, they are very clean, very deep filters. (Although I wouldn't trust them for actual laser work.)

I got a pair of reds for about $2 plus postage. They can be worn over glasses, but aren't clip-on. Red might be too extreme for tablet reading (I use mine for circadian manipulation), but you can get $2-3 yellow or orange glasses on eBay too.

That's why I now use Flux + Night Shift 24/7. And I now also turn off all my devices hours before sleeping. Yes, it's hard and we all have work deadlines, but if you don't have eyes you cannot work! So...Just wake up earlier and get more or the same amount of work done. Also take more eye breaks where you are looking into nature and sun gazing. Do eye exercises as well. Google eye exercise. Your eyes have muscles too and should be kept in good shape just like any other muscles. This is no joke people. If you have kids enforce strict usage and always cut the blue light. And don't get me started about the 5G that's rolling out.

Google these:
5G WiFi and health
Eye exercises

@in_gene

in my 800k I dont see green:

0_1539067515281_5e853566-fe1d-4765-9c79-583439b5f4ab-image.png

800k is fine, but before bad time best mode is black mode ;)

Well the main difference is in how much room lighting is filtered. So if you have bright room lighting and can't adjust it (like at the office) you might wear glasses for that.

If you're worried about backlight leakage through "black" pixels, well, I wouldn't worry at all - the amounts of light are so small that they don't have an effect, when compared to anything that's not black.

@racijr said in In Game F.lux is much brighter than in windows or browser screen, how to set it to the same brightness.:

Oh, thats so bad, but still it's brighter even in window or borderless tested on hearthstone and minecraft

Brighter, or 6500K? Which?

f.lux is very good at blocking light like this, but we do not think there is anything to worry about from this study. Light from screens is just too dim.

A blue sky (not the sun, only the blue part) makes 20 times as much light as a screen, and it occupies a lot more of the visual field. And it is likely the study used a lot more light than this.

The published article does not measure irradiance at the eye - it uses lasers that are explained using "power" and not "power/area", so for now we are assuming these results are a new mechanism (which is important) but that it falls in the existing hazard range, so we don't worry about it, because it's a ton of light.

The "blue light hazard" has been identified for many years and incorporated into international standards, and every LED is regulated by these, but typically these hazards happen at >10,000 cd/m2 for white light, as opposed to 200 cd/m2 for a typical display screen.