Twilight: Blue light filter icon

Twilight: Blue light filter APK

9.5 | 7 Reviews | 5 Posts

The description of Twilight: Blue light filter

Are you having trouble falling asleep? Are your kids hyperactive when playing with the tablet before bed time?
Are you using your smart phone or tablet in the late evening? Twilight may be a solution for you!

WARNING: Android O does no allow the app to cover your notifications any more..

Recent research suggests that exposure to blue light before sleep may distort your natural (circadian) rhythm and cause inability to fall asleep.

The cause is the photoreceptor in your eyes, called Melanopsin. This receptor is sensitive to a narrow band of blue light in the 460-480nm range which may suppress Melatonin production - a hormone responsible for your healthy sleep-wake cycles.

In experimental scientific studies it has been shown an average person reading on a tablet or smart phone for a couple of hours before bed time may find their sleep delayed by about an hour.

The Twilight app makes your device screen adapt to the time of the day. It filters the flux of blue light emitted by your phone or tablet after sunset and protects your eyes with a soft and pleasant red filter. The filter intensity is smoothly adjusted to the sun cycle based on your local sunset and sunrise times.


Documentation
http://twilight.urbandroid.org/doc/

Get more from Twilight
1) Bed reading: Twilight is more pleasant on the eyes for night reading. Especially as it is able to lower the screen backlight far below the ability of the backligt controls on your screen

2) AMOLED screens: We have tested Twilight on an AMOLED screen for 2.5 years without any sign of depletion or over-burning. If properly configured Twilight causes less light emission (by enabling dimming) with more equal light distribution (dark areas of the screen such as the status bar get tinted). This may in fact increase your AMOLED screen life time.

Basics on circadian rhythm and the role of melatonin
http://en.wikipedia.org/wiki/Melatonin
http://en.wikipedia.org/wiki/Melanopsin
http://en.wikipedia.org/wiki/Circadian_rhythms
http://en.wikipedia.org/wiki/Circadian_rhythm_disorder

Permissions
- location - to find out your current sunset/surise times
- running apps - to stop Twilight in selected apps
- write settings - to set back-light
- network - access smartlight (Philips HUE) to shield you household light from blue

Automation (Tasker or other)
https://sites.google.com/site/twilight4android/automation

Related scientific research

Amplitude Reduction and Phase Shifts of Melatonin, Cortisol and Other Circadian Rhythms after a Gradual Advance of Sleep and Light Exposure in Humans Derk-Jan Dijk, & Co 2012

Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans Joshua J. Gooley, Kyle Chamberlain, Kurt A. Smith & Co, 2011

Effect of Light on Human Circadian Physiology Jeanne F. Duffy, Charles A. Czeisler 2009

Efficacy of a single sequence of intermittent bright light pulses for delaying circadian phase in humans Claude Gronfier, Kenneth P. Wright, & Co 2009

Intrinsic period and light intensity determine the phase relationship between melatonin and sleep in humans Kenneth P. Wright, Claude Gronfier & Co 2009

The Impact of Sleep Timing and Bright Light Exposure on Attentional Impairment during Night Work Nayantara Santhi & Co 2008

Short-Wavelength Light Sensitivity of Circadian, Pupillary, and Visual Awareness in Humans Lacking an Outer Retina Farhan H. Zaidi & Co, 2007

High sensitivity of the human circadian melatonin rhythm to resetting by short wavelength light. Lockley SW & Co. 2003

Sensitivity of the human circadian pacemaker to nocturnal light: melatonin phase resetting and suppression Jamie M Zeitzer, Derk-Jan Dijk & Co 2000

For a desktop alternative, try RedShift (Linux) or on Windows the app which has no relation to this project whatsoever, whose name cannot be said aloud or whispered as it is a Trademark, lets call it Lord Voldemort of the blue light flux filtering apps.Guessed it? Let us know in the comments.
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What's new

2018-05-29
- fix for adaptive con on Pixels
- new translations (many thanks)
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Twilight: Blue light filter APK Version History
Request Twilight: Blue light filter UpdateRequest Update
Twilight: Blue light filter 8.3 for Android 4.0+ APK Download

Version: 8.3 (277) for Android 4.0+ (Ice Cream Sandwich, API 14)

Update on: 2018-05-29

Signature: 00a0e53c9a3f5d14da5e698ff420e4a7776ea4b1 Twilight: Blue light filter 8.3(277) apk safe verified

APK File SHA1: 2ff8648d3b0d2be9bf8fdb3e992d01412408c443

What's new: - fix for adaptive con on Pixels - new translations (many thanks)

Download APK(5.7 MB)

Twilight: Blue light filter 8.3 for Android 4.0+ APK Download

Version: 8.3 (275) for Android 4.0+ (Ice Cream Sandwich, API 14)

Update on: 2018-05-28

Signature: 00a0e53c9a3f5d14da5e698ff420e4a7776ea4b1 Twilight: Blue light filter 8.3(275) apk safe verified

APK File SHA1: 5059f810381667f203094031276302b084088fb3

What's new: - fix for adaptive con on Pixels - new translations (many thanks)

Download APK(5.7 MB)

Twilight: Blue light filter 8.2 for Android 4.0+ APK Download

Version: 8.2 (271) for Android 4.0+ (Ice Cream Sandwich, API 14)

Update on: 2018-03-21

Signature: 00a0e53c9a3f5d14da5e698ff420e4a7776ea4b1 Twilight: Blue light filter 8.2(271) apk safe verified

APK File SHA1: 720e1647f49bb70c617c9a6aaa07d87898f48f91

What's new: 8.2 - wallpaper filtering fixes- fix for scheduled stop of the app8.1- More...

Download APK(5.7 MB)

Twilight: Blue light filter 8.1 for Android 4.0+ APK Download

Version: 8.1 (267) for Android 4.0+ (Ice Cream Sandwich, API 14)

Update on: 2017-12-15

Signature: 00a0e53c9a3f5d14da5e698ff420e4a7776ea4b1 Twilight: Blue light filter 8.1(267) apk safe verified

APK File SHA1: cae33d7e72559a5c8eae56026515b167de945ffe

What's new: 8.1 - fix for Android 5.X auto-pause in apps issues- fix for Chromeboo More...

Download APK(5.6 MB)

Twilight: Blue light filter 8.0 for Android 4.0+ APK Download

Version: 8.0 (262) for Android 4.0+ (Ice Cream Sandwich, API 14)

Update on: 2017-12-01

Signature: 00a0e53c9a3f5d14da5e698ff420e4a7776ea4b1 Twilight: Blue light filter 8.0(262) apk safe verified

APK File SHA1: a037565d9429b25ab66b1057f7e8d7dba313c948

What's new: 8.0 - Black quick settings tile panel with Android 8.1 and home screen More...

Download APK(5.6 MB)

Twilight: Blue light filter 7.7 for Android 4.0+ APK Download

Version: 7.7 (244) for Android 4.0+ (Ice Cream Sandwich, API 14)

Update on: 2017-10-03

Signature: 00a0e53c9a3f5d14da5e698ff420e4a7776ea4b1 Twilight: Blue light filter 7.7(244) apk safe verified

APK File SHA1: bf98165b68f4cfdf768d3babdb7c89dac52f7b6a

What's new: 7.7 - ability to filter lock screen / home screen wallpaper separately More...

Download APK(4.8 MB)

Twilight: Blue light filter 7.7 for Android 4.0+ APK Download

Version: 7.7 (240) for Android 4.0+ (Ice Cream Sandwich, API 14)

Update on: 2017-09-26

Signature: 00a0e53c9a3f5d14da5e698ff420e4a7776ea4b1 Twilight: Blue light filter 7.7(240) apk safe verified

APK File SHA1: e3cc43d96e5a1be55d923fb195692479cd85c44c

What's new: 7.7 - ability to filter lock screen / home screen wallpaper separately More...

Download APK(4.6 MB)

Twilight: Blue light filter 7.5 for Android 4.0+ APK Download

Version: 7.5 (232) for Android 4.0+ (Ice Cream Sandwich, API 14)

Update on: 2017-09-16

Signature: 00a0e53c9a3f5d14da5e698ff420e4a7776ea4b1 Twilight: Blue light filter 7.5(232) apk safe verified

APK File SHA1: 483018c344bf3b19f9a24ae55027c64d938b8aff

What's new: 7.5 - Android O adaptive icon support- fixes in wallpaper filtering7.4 More...

Download APK(4.4 MB)

Twilight: Blue light filter 7.3 for Android 4.0+ APK Download

Version: 7.3 (223) for Android 4.0+ (Ice Cream Sandwich, API 14)

Update on: 2017-05-24

Signature: 00a0e53c9a3f5d14da5e698ff420e4a7776ea4b1 Twilight: Blue light filter 7.3(223) apk safe verified

APK File SHA1: 32d588d586c3fda94bac1ef93fa41a236248229f

What's new: 7.3 - support for ultra-wide screens- shortcut support (Android 7.1)- More...

Download APK(4.4 MB)

Twilight: Blue light filter 7.3 for Android 4.0+ APK Download

Version: 7.3 (220) for Android 4.0+ (Ice Cream Sandwich, API 14)

Update on: 2017-03-29

Signature: 00a0e53c9a3f5d14da5e698ff420e4a7776ea4b1 Twilight: Blue light filter 7.3(220) apk safe verified

APK File SHA1: 7b71636790064089f77789354ac28b38356ab105

What's new: 7.3 - shortcut support (Android 7.1)- multi window support7.2- improv More...

Download APK(4.3 MB)

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