@herf cool, so just a hair past blue is more violet blue instead of regular blue! I had always wondered this as led bulbs have that half blue / violet spike and maybe that's part of what makes their strange tint, example GE's Align PM. I think the lack of aqua / cyan also plays a big role in the off blue/violet tint.

@inGearX Well, if your really curious, do you use Linux?

@alexncfc said:

I am very interested by the concept of filtering out the blue light, but I am noticing that since using these blue light filters on my PC and phone, I have a banging headache. I actually feel strained looking at the screen with the filter on (when I turn it off temporarily, admittedly it's even worse, it feels like I am being blinded!)

Has anyone experienced similar issues such as eye strain and headaches when using the filter? Also, has anyone noticed that they feel they sleep better and feel refreshed etc since using f.lux?

The eye strain and headaches you are experiencing may be caused by setting the screen brightness too low for your eyes to focus comfortably since warmer colors have lower intensity. Try adjusting the brightness a little higher than the current setting that is causing the strain. You can also adjust the lighting in the room that you are using the device in to a brightness that is relatively lower than your screen. Also avoid having just certain areas lighted in your room, like a lamp that only lights up a small area. Non uniform lighting around you can also affect the eyes.

Hope these helps rid you of your ailments. Cheers.

@DuoArtworks said:

Did i set something wrong in the settings?
http://prnt.sc/ckph1z
or what can it be ?

and how can i control the point that he stops when i want
http://prnt.sc/ckplr3

Thanks for every answer!

I can show you a Registry edit that will enable color temperatures warmer than 2700K, but they aren't 100% user-friendly unless you are very good with computers.

To the 2nd question, that's just a Preview. You can't control it. It's just showing you a quick overview of all the color temperatures.

Before the update W10, it worked ...

@Tungsten_smooth
Thank u v. Much .
This method works .

@lorna Not much diffusion, it is a mostly frosted neodymium glass, and it's in a domed white lamp, so it reflects off that as well. It's not a clear bulb, but I think ~1200 lumens may be just a bit over the top.

@lorna So do you have beta builds of 37.7 somewhere? Or something like a good time table for a latitude where it gets dark at 21ish all tear?
Because 3.10 is latest Windows, and has been for what... 3 years now?

As well: distance is the other major variable. You can use f.luxometer to simulate an iPhone at 2" distance, which is about what you'd want for light therapy!

Turns out VR goggles are a good option for this.

Any color temperature you want, really. Just keep in mind that you want to avoid all sources of bluish alerting bright light at night so that you don't prevent your production of melatonin from happening. This means that you are using f.lux as a way to enable you to use your computer without being blasted by alerting light. If you're still being blasted by alerting light from other things in your home right before you go to bed (like in the last 2-3 hours of your day), then f.lux can almost be pointless.

So let's say you've decided to avoid watching T.V. at night because you can't have f.lux on your T.V. That would be a good idea. Let's say you decided to have special light fixtures that have VERY warm light bulbs in them and these are the only sources of light you use at night. That would be another great idea! Now, let's say that you don't know about f.lux yet and you go to use your computer and you get blasted by this bright blue light. Ouch. Now what? That's where f.lux comes in. It enables you to use your computer at night without being "woken up".

During the day, use whatever you want. I just leave mine at 6500K. It doesn't matter what you use, as long as you like it.

Regarding the Intel HD Graphics Control Panel settings, I don't know if the brightness is actually controlling the backlight's brightness. It should be because it's a built-in display, but it's worth seeing if you have alternative ways to adjust the brightness. If you have other ways, then compare both to see which one is clearly actually adjusting the backlight's brightness and use that adjustment only (you'll be able to tell - one will look better when it dims). You want to use the lowest brightness that you can tolerate for the best results when you're using f.lux at night to avoid blue light.

It doesn't end there, though. Loud sounds are alerting too, and so is hard work with your muscles like exercise or doing physically-difficult things.

All in all, you just want your at-night experience to be like it is outside when the sun sets. Low light with no blue light, and nice and quiet and peaceful. You want to put yourself to sleep gently, not suddenly. Most people try to go right to bed after doing a lot of things like watching TV, playing video games, listening to good music, and then doing things in the bathroom with their super bright vanity lights on. Some people also don't know how to slow down at night and move around calmly and in a relaxed way. It's like they're always in a hurry and then they wonder why they have a hard time falling asleep. lol

So another thing to know is, you kinda want to enable the body's core to cool down and you want the mind to calm down too. It's not just about light.

@rawraj My thoughts on Darkroom or other? I personally love Darkroom for use at night, but I don't have lab data on how alerting it is. Melanopically speaking (the ipRGCs that impact your circadian rhythm) it has no measurable effect. The visual system is complex though, another active area of research.