Turn On or Off Night Light in Windows 10  

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    Turn On or Off Night Light in Windows 10

    Turn On or Off Night Light in Windows 10

    How to Turn On or Off Night Light in Windows 10
    Published by Category: General Tips
    03 Apr 2020
    Designer Media Ltd

    How to Turn On or Off Night Light in Windows 10


    Your display emits blue light—the kind of light you see during the day—which can keep you up at night. To help you get to sleep, turn on night light and your display will show warmer colors at night that are easier on your eyes.

    Starting with Windows 10 build 15002, you can now turn on or off blue light reduction.

    Starting with Windows 10 build 15014, Microsoft has adjusted the animation when lowering blue light to be a bit smoother. They also made some polish tweaks to Blue Light Settings with more coming soon.

    Starting with Windows 10 build 15019, the "blue light" feature has been renamed to night light to make it more accurately reflect what the feature does. Microsoft made some improvements to the night light feature that lets you preview the setting before applying it.

    Starting with Windows 10 build 15025, the night light color temperature range has been extended to go down to very red (1200 K) and the entire range of the slider now works correctly.

    This tutorial will show you how to turn on or off night light to reduce blue light for your account in Windows 10.

    Devices with DisplayLink or Basic Display Driver graphics drivers, or devices using HDR, do not support the night light feature. If your night light toggle is grayed out, you may need to update your display driver.


    The Night Light settings will be stored in the registry keys below for the current user.

    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\CloudStore\Store\DefaultAccount\Current\default$windows.data.bluelightreduction.bluelightreductionstate

    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\CloudStore\Store\DefaultAccount\Current\default$windows.data.bluelightreduction.settings



    Contents







    OPTION ONE

    To Turn On or Off Night Light in Action Center


    1 Open Action Center.

    2 Click/tap on the Night light button to toggle it on or off. (see screenshots below)

    Turn On or Off Night Light in Windows 10-night_light_in_action_center.jpg






    OPTION TWO

    To Turn On or Off Night Light in Settings


    1 Open Settings, and click/tap on the System icon.

    2 Click/tap on Display on the left side, and click/tap on the Night light settings link under Brightness and color on the right side. (see screenshot below)

    Turn On or Off Night Light in Windows 10-night_light_settings-1.jpg

    3 Click/tap on the Turn on now or Turn off now button for what you want, and adjust the Strength slider for the color temperature at night level you want. (see screenshot below)

    You can hover the pointer on the slider to see the current strength level. 48 is the default strength level.

    If you have the Night light schedule turned on, then night light will only stay turned on or off until the scheduled time you have set.


    Our member s0urce has provided the color temperatures in Kelvin for the strength percentage level:


    Code:
    1200K = 100%
    1250K = 100%
    1300K = 99%
    1350K = 98%
    1400K = 97%
    1450K = 95%
    1500K = 95%
    1550K = 94%
    1600K = 93%
    1650K = 92%
    1700K = 91%
    1750K = 90%
    1800K = 89%
    1850K = 88%
    1900K = 87%
    1950K = 86%
    2000K = 85%
    2050K = 84%
    2100K = 83%
    2150K = 83%
    2200K = 82%
    2250K = 81%
    2300K = 80%
    2350K = 79%
    2400K = 78%
    2450K = 77%
    2500K = 76%
    2550K = 75%
    2600K = 74%
    2650K = 73%
    2700K = 72%
    2750K = 71%
    2800K = 70%
    2850K = 69%
    2900K = 68%
    3000K = 67%
    3050K = 66%
    3100K = 65%
    3150K = 64%
    3200K = 63%
    3250K = 62%
    3300K = 61%
    3350K = 60%
    3400K = 59%
    3450K = 58%
    3500K = 57%
    3550K = 56%
    3600K = 55%
    3650K = 54%
    3700K = 53%
    3750K = 52%
    3800K = 51%
    3850K = 50%
    3900K = 50%
    3950K = 49%
    4000K = 48%
    4050K = 47%
    4100K = 46%
    4150K = 45%
    4200K = 44%
    4250K = 43%
    4300K = 42%
    4350K = 41%
    4400K = 40%
    4450K = 39%
    4500K = 38%
    4550K = 37%
    4600K = 36%
    4650K = 35%
    4700K = 34%
    4750K = 34%
    4800K = 33%
    4850K = 32%
    4900K = 31%
    4950K = 30%
    5000K = 29%
    5050K = 28%
    5100K = 27%
    5150K = 26%
    5200K = 25%
    5250K = 24%
    5300K = 23%
    5350K = 22%
    5400K = 21%
    5450K = 20%
    5500K = 19%
    5550K = 18%
    5600K = 17%
    5650K = 17%
    5700K = 16%
    5750K = 15%
    5800K = 14%
    5850K = 13%
    5900K = 12%
    5950K = 11%
    6000K = 10%
    6050K = 9%
    6100K = 8%
    6150K = 7%
    6200K = 6%
    6250K = 5% 
    6300K = 4%
    6350K = 3%
    6400K = 2%
    6450K = 1%
    6500K = 0%
    Turn On or Off Night Light in Windows 10-night_light_settings-2.jpg

    4 You can now close Settings if you like.






    OPTION THREE

    To Turn On or Off Night Light Schedule in Settings


    1 Open Settings, and click/tap on the System icon.

    2 Click/tap on Display on the left side, and turn on or off Night light schedule under Brightness and color on the right side for what you want. (see screenshot below)

    3 You can now close Settings if you like.

    Turn On or Off Night Light in Windows 10-night_light_schedule.jpg






    OPTION FOUR

    To Change Night Light Schedule in Settings


    1 Open Settings, and click/tap on the System icon.

    2 Click/tap on Display on the left side, and click/tap on the Night light settings link under Brightness and color on the right side. (see screenshot below)

    Turn On or Off Night Light in Windows 10-night_light_settings-1.jpg

    3 If you haven't already, you will need to turn on Schedule night light to be able to change its settings. (see screenshot below)

    Turn On or Off Night Light in Windows 10-night_light_schedule_settings-1.jpg

    4 Do step 5 (sunset) or step 6 (set hours) for the schedule you want to use.


     5. To Use "Sunset to sunrise" Schedule

    A) Select (dot) Sunset to sunrise, and go to step 7 below. (see screenshot below)

    You will need to turn on Location services to use sunset.


    Turn On or Off Night Light in Windows 10-location_settings.png
    Turn On or Off Night Light in Windows 10-night_light_schedule_settings-2.jpg


     6. To Use "Set hours" Schedule

    A) Select (dot) Set hours. (see screenshot below)

    B) Set the time you want to automatically Turn on and Turn off blue light reduction, and go to step 7 below. (see screenshot below)

    Turn On or Off Night Light in Windows 10-night_light_schedule_settings-3.jpg

    7 You can now close Settings if you like.


    That's it,
    Shawn






  1. Posts : 120
    Win10
       #1

    Why is mine stuck on?

    Turn On or Off Night Light in Windows 10-image.png
      My Computer


  2. Posts : 69,348
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #2

    Hello ClassicD, :)

    Sometimes updating your graphics driver to the latest version helps.

    If that doesn't help, then you might see if downloading and merging the .reg file below to recover Night Light Default data may.

    Night_Light.reg

    (contents)

    Code:
    [-HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\CloudStore\Store\Cache\DefaultAccount\$$windows.data.bluelightreduction.bluelightreductionstate]
    
    [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\CloudStore\Store\Cache\DefaultAccount\$$windows.data.bluelightreduction.bluelightreductionstate\Current]
    "Data"=hex:02,00,00,00,26,a9,0c,cc,2b,d3,d2,01,00,00,00,00,43,42,01,00,c6,14,\
      ad,99,b0,e0,bc,e5,b4,e9,01,00
    
    [-HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\CloudStore\Store\Cache\DefaultAccount\$$windows.data.bluelightreduction.settings]
    
    [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\CloudStore\Store\Cache\DefaultAccount\$$windows.data.bluelightreduction.settings\Current]
    "Data"=hex:02,00,00,00,e4,cb,20,ce,2b,d3,d2,01,00,00,00,00,43,42,01,00,ca,14,\
      0e,15,00,ca,1e,0e,07,00,ca,32,0e,14,2e,22,00,ca,3c,0e,06,2e,16,00,00
      My Computers


  3. Posts : 120
    Win10
       #3

    Thanks Brink for your reply.

    Oh dear i wish i never enabled this feature. The reg file only worked once, it stays on whether i enable or disable. Its been slightly frustrating to be honest. I need to restart PC to keep it off.

    i have seen this a lot causing issues, some websites actually advise to reinstall windows...
      My Computer


  4. Posts : 69,348
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #4

    You shouldn't need to reinstall Windows for this. That's a pretty big sledgehammer fix.

    Did you update your graphics driver?
      My Computers


  5. Posts : 120
    Win10
       #5

    Yea fully updated. Thats what i thought, surley thats too extreme due to a simple windows feature, didn't hold much hope for the future.

    I have disabled the feature now, it always starts around 9pm GMT so i will find out later if it has worked.

    Thanks
    Last edited by ClassicD; 23 May 2017 at 05:39.
      My Computer


  6. Posts : 69,348
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #6

    I look forward to hearing your results.
      My Computers


  7. Posts : 120
    Win10
       #7

    Thanks for your enthusiasm Brink, all worked ok!
      My Computer


  8. Posts : 69,348
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #8

    Great news.
      My Computers


  9. Posts : 395
    Windows 10 Pro, Ver. 21H2 (OS Build 19044.1706)
       #9

    Hi Brink,
    You've got some great Holiday Attire. Nice.
    -
    I read this thread hoping to find a desktop shortcut to turn nightlight on and off as well as adjust the color temperature.
    Might that be too much to dream about for a Christmas surprise?

    Best wishes for a wonderful holiday season!
      My Computer


 

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