Tiny Flashlight + LED
A smartphone can save the day when you suddenly find yourself in the dark. The Tiny Flashlight + LED app is perfect for such occasions: It provides a variety of lock screen widgets to turn your phone's flash onto its brightest setting with a single tap.
Once you're past the lock screen, the Tiny Flashlight app supports a variety of different light patterns and styles. In my tests, however, its lock screen widgets all performed just the same basic on-and-off function; the only noticeable difference was in the style of the on-screen buttons.
Tiny Flashlight + LED is available for free in the Google Play Store.