Blue light filter Test

and How to check if my Monitor emits Blue light?

In this article, I want to show you how you can test if your monitor emits blue light.

To check if your monitor emits blue light click the image below to open it in a new tab.

This will open an animation which switches from blue to black.

To check if your monitor emits both blue and green light click the image below.

This will open an animation which switches from the combination of blue and green to black.

What to observe?

Ideally, if your monitor doesn’t emit blue or blue and green light you shouldn’t see a change in the color.

You should only see black square without any change of the color or hue like this

How to block all blue light?

Most blue light filters whether they are glasses, software or physical filters will not block all blue light.

Some of the time this is intentional because they only block part of the blue light spectrum or the goal is the screen to look more normal.

When all blue light is blocked the screen will look really green or really red.

When part of the blue light is blocked the screen will look yellow or orange.

Blue light filter Glasses

If your glasses look like the image above there is a high chance that they don’t do anything to block the blue light from your screen.

To block all blue light you probably will need some glasses with a red tint

Most of the effective blue light blocking glasses look like this.

In reality, however, this will also block all blue light and all green light.

This makes it really strange for me why nobody manufactures glasses with a green tint which will block all blue and red light

This will be interesting to test but if you only need to block the blue light you need some deep yellow or a little orange tint like this

So test your glasses with the test pictures at the beginningย of this article.

If you see a black square at the first image then your glasses block all blue light.

If you see a black square at the second image then your glasses block both blue and green light.

Blue light filter Software

Software solutions by default will make the screen more orange which will block part of the blue and part of the green light.

Even from my experience if a person hasn’t heard of theย bad effects of blue light he will probably not like the red screen at first.

Even to this day I still don’t block all the blue light from my screen because this makes my screen a little uncomfortable.

Same is true with the glasses. If all blue light is blocked everything will look red.

So be it Iris, f.lux, Redshift or any other software for eye protection and sleep improvement they will usually use 3400K at night by default which is half of the blue light.

You may notice that at 3400K there is still blue light visible

This is still helpful and I have talked to a lot of users about what they prefer and orange screen helps with eye strain and eye pain a lot.

The goal of Iris is to be eye protection software first and sleep improvement tool second.

I believe eye problems are way worse than sleep problems because you can fix your sleep just by cutting the computer usage at night.

Blocking all blue

However, if you really want to biohack and improve your sleep you need to go to 1900K or bellow.

1900K is the first value which will block all blue light and your screen will look deep orange.

This is why in the latest versions f.lux tries to set the color temperature to 1900K by default.

They are trying to force people to learn to remove all blue light for best sleep.

While you may notice that the first versions of f.lux don’t even have this option in the sliders.

There are a couple of differences in the different blue light blocking software products.

Iris operates at % of blue light + showing the color temperature at the upper right corner.

F.lux uses color temperature + showing light sources types.

For example in f.lux Halogen means 3400K while Candle means 1900K.

Basically, if you want to remove all blue light from your screen you want to strive for 1900K or Candle.

If you have trouble with the K values see this link What are the K values?

Everything bellow starts to cut also the green light which the latest medical researchers point that also have some effect on our sleep.

Blocking all blue and green

So if you really want to improve your sleep you also need to cut all green light at basically set Iris blue light to 0%

Notice how when all blue light and all green light is blocked how the screen is deep red.

You can achieve the same thing by using Sleep or Biohacker type.

Blue light physical filters

I will not go into too many details about the filters you place on your monitor because the logic is basically the same as with the glasses.

You need a red filter to block all blue and green light.

You need a yellow filter to block all blue light.

If you look at the picture above you need the second or the third filter.

This will block all blue light or all blue and green light.

Tell Friends

If you liked this article and you learned new things about how to block blue light

If you learned how to improve your sleep and feel less eye strain

If you want more and more peopleย to learn about this

If you want your friends to protect themselves from the monitor harmfulย  rays and emissions

30 thoughts on “Blue light filter Test

    1. I have an idea how this can be fixed for future versions but basically, the text will disappear right now.
      You need to change the color of the text

  1. Hallo – I have attempted to check if my monitor emits both the blue light and blue and green light each on a separate tab.
    The animation does not appear in either.

    Do I need a programme for this?

    Thanks in advance.

  2. Hi Daniel
    I am confused once again! I just want the healthiest option in one click and so use the Manual and Health setting – is this all I need? If I want to eliminate blue/green light do I have to specifically choose Sleep or Biohacker? If I want to eliminate sub-pixel flicker do I have to choose Reading? If I want to eliminate PWM flicker do I have to set Brightness to Max? What I am saying is how do I combine ALL these fixes in one setting or is that not possible?

    1. Hi Maguel,
      We can’t control the hardware brightness of your monitor (the one that you set using your monitor keys) that’s why you can’t remove PWM Flicker with a click of a button
      We do have a short video on how to remove PWM Flicker with Iris here:

      I think it will help

      If you want one click simple setings for blue light, I’d suggest sticking to Mode: Automatic Type: Health
      When you are using automatic mode Iris will adjust the blue light values depending on the time of day/night and it will do the work for you ๐Ÿ™‚

  3. I installed IRIS and did not realize I was required to pay…I think I did a trial before and it was too hard to use. I need good bluelight protection ( macular degeneratin beginning) and I use F.lux on ember at night but now there seems to be no way to change the daytime to 1900 anymore. I a am disabled senior on a fixed income and would very much like help with all if this. If you could guide me that would be great!
    I also want to mention your chat box covers the screen and there is no way to exit…so it is nearly impossible to read your page here or work with the blue light tests without scrolling all the way to the bottom and reading one line at a time under the chat box…quite annoying ๐Ÿ™‚

    1. You can try our latest version here:

      We have a lot of video tutorials now and I can assist you if anything seems hard

      To begin with, this is a video on how to control blue light, you can set it to any value you want ๐Ÿ™‚

      And this is how to remove PWM Flicker

      If there’s anything more you can message us here and we’ll help with screenshots and videos

      If you want to stop the chat extension you can just click the blue messenger icon and it will close. You are right we should make it simpler and we will try to

  4. Great article. Whatโ€™s the recommendation for a work computer where we donโ€™t have access to IRIS or other blue blocking software and we work late (til 9 pm)? Do you recommend draping some kind of screen filter over or blue blocking glasses? I always feel stimulated when I come home from work and have trouble winding down

    1. If you can get a physical blue light filter that will help you, while it’s not Iris and you have less customizability it’s still much better than nothing

      We have a guide over here that compares Iris to other blue light filters and there is also info about them that will surely help you in this case:

  5. Hello

    I need glasses. I play everyday a VR Boxing game for some minutes and i want to wear glasses under them.
    I set brighness very low in the game and contrast too.
    I have tried multiple glasses. The one which blocks most (2 squares are black) is way to big and unconfortable.
    Any tipps which glasses are really good if i cant use Iris or flux?

    Thanks in advance

    1. If getting blue light blocking glasses is a must for you, I think you can get some from these guys:

      They’ve been in business long enough and I personally like them and trust their brand so I think it would not be a mistake

      They also have different models so maybe you will find one that will fit you best for your situation

  6. why do I have to block green Light?
    I tough blue light was the only bad for my eyes. Let me know if I wrong.

  7. I have an Android LG G6 phone and when I try to download the software it only downloads Iris Mini which does nothing for me. How do I download the software for Iris?

  8. Hey, before bed I use my smartphone (it’s old, doesn’t support Iris) to listen to some podcasts. Do you can suggest to me a red glasses (that blocks blue and green lights)?


    1. Everything should work. Even some cheap plastic red glasses. Aside from what blue blocking glasses manufacture tell in their marketing campaigns, the truth is that all red glasses block all blue light ๐Ÿ™‚

  9. in China, we eye professor recommend a color mix which is do good to eyes.

    SOFT green๏ผš
    a. RGB๏ผš199๏ผ›237๏ผ›204
    b. HEX๏ผšC7EDCC
    c. Hue๏ผš85๏ผ›Sat๏ผš123; Lum:205

  10. .Could all this be simplified to what and where to buy red or orange filter. I don’t care about the endless tests and details.

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