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From Polyphasic Sleep Wiki
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Add paragraph about Sunsetscreen settings. changed minimal possible settings for f.lux, fixed a few spellings
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If you live in a space where you are in control of the lighting, it is possible to use either RGB or pure red LED lights during dark period to avoid the inconvenience and/or discomfort from wearing goggles. However, you must still be sure that you wear dark period glasses when looking at screens such as your electronic devices, and if you live in an area with bright lights outside your house, it is best to draw your blinds (blackout curtains ideally) in order to block any external light.
 
If you live in a space where you are in control of the lighting, it is possible to use either RGB or pure red LED lights during dark period to avoid the inconvenience and/or discomfort from wearing goggles. However, you must still be sure that you wear dark period glasses when looking at screens such as your electronic devices, and if you live in an area with bright lights outside your house, it is best to draw your blinds (blackout curtains ideally) in order to block any external light.
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=== Computer screen colour filters === <!--T:16-->
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=== Computer screen color filters === <!--T:16-->
    
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{| class="wikitable"
 
{| class="wikitable"
|+Comparison of colour filter software
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|+Comparison of color filter software
 
!Name
 
!Name
 
!OS support
 
!OS support
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|Yes
 
|Yes
 
|[https://www.neowin.net/news/sunsetscreen-128/ last freeware version]
 
|[https://www.neowin.net/news/sunsetscreen-128/ last freeware version]
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|-
 +
|F.lux
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|Windows
 +
|limited
 +
|[https://justgetflux.com/faq.html faq link]
 
|-
 
|-
 
|Redshift
 
|Redshift
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|Yes
 
|Yes
 
|[https://wiki.archlinux.org/index.php/redshift#Configuration configuration last full free version]
 
|[https://wiki.archlinux.org/index.php/redshift#Configuration configuration last full free version]
|-
  −
|F.lux
  −
|Windows
  −
|Yes
  −
|[https://justgetflux.com/faq.html faq link]
   
|-
 
|-
 
|iOS&macOS native feature
 
|iOS&macOS native feature
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|[https://www.skyatnightmagazine.com/advice/how-to-turn-your-iphone-screen-red-for-astronomy/ tutorial]
 
|[https://www.skyatnightmagazine.com/advice/how-to-turn-your-iphone-screen-red-for-astronomy/ tutorial]
 
|}
 
|}
For all of these software packages, you should change the colour temperature to the minimum possible (1000K for redshift, 1200K for f.lux).
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For all of these software packages, you should change the color temperature to the lowest possible usable value (1000K for redshift, 800K for f.lux).
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For the purpose of DP management on Windows OS, SunsetScreen is the preferable choice over the widely more popular f.lux, as the latter does not allow setting user defined start and beginning times in conjunction and enforces a preset duration for the color shift, which will not be optimal for many schedules, to circumvent this, the user has to manually shift down the color temperature (by repeatedly pressing '''"Shift+Alt+Page Down"''' key), moreover, this custom setting is not stored and overwrites the automatic color shift timing, forcing the user to repeat the same procedure at least once per day.
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Additionally, SunsetScreen allows setting predefined values for brightness for day and night setting separately and offers the option of toggling a color inversion mode by hotkey.
    
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For Linux on Wayland, please use the night light options offered by your desktop environment (KDE and GNOME offer this feature). Editing the colour temperature manually might be necessary to achieve the amount needed. [https://www.omgubuntu.co.uk/2017/07/adjust-color-temperature-gnome-night-light Change colour temperature on GNOME]
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For Linux on Wayland, please use the night light options offered by your desktop environment (KDE and GNOME offer this feature). Editing the color temperature manually might be necessary to achieve the amount needed. [https://www.omgubuntu.co.uk/2017/07/adjust-color-temperature-gnome-night-light Change color temperature on GNOME]
    
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'''Note''' that, even with all the red colour filtered away, all screens, with the exception of OLED screens on some phones, '''will bleed backlight''', which is white and can compromise your dark period. Depending on the quality and brightness setting of your screen, this may or may not be an issue.
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'''Note''' that, even with all the red color filtered away, all screens, except for OLED screens on some phones, '''will bleed backlight''', which is white and can compromise your dark period. Depending on the quality and brightness setting of your screen, this may or may not be an issue.
    
== Living with dark period == <!--T:20-->
 
== Living with dark period == <!--T:20-->
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