Select red at 60% Then reduce your phone's brightness from the notification window. Your phone should now be colored red. You can set this as a Bixby quick command if you preset your color scheme in accessibility. The command I made: Titled it "Stargazing" then said Turn on color lens and then reduce screen brightness to 25% (your results may vary). Red Light 2.2 APK download for Android. Shows red screen to light the night without ruining your night time vision.
Red Light 5.0.2 APK download for Android. Simple Red Light Simulator app consisting of white flashlight and red screen. In astrophotography, a red screen is necessary. In this article, we will go over making your device red to protect your night vision.