[johnaldmilligan] disassembled a handheld spotlight to use as the housing ... cramming everything into the flashlight and covering the LCD screen with some X-ray film to dim the display for ...

When activated from the At a Glance widget, it doesn't help you turn on the flashlight. However, a reminder appears to tell you that it's on. It's best to use it with the lock screen shortcut.

and use it as a flashlight to find your way around in the dark. It's always just one swipe away in the phone's Notification bar. 1. From any screen - even if the Galaxy S10 is locked - swipe down ...