http://www.samsung.com/us/article/tips--tricks-galaxy-rugby-pro-at-t- seems to note the Assistive Widget that does that.

"Widgets

Assistive Light:
Adding to its durable, outdoorsy nature, the Galaxy Rugby Pro features an optional Assistive Light widget that can turn the LED flash into a powerful flashlight. To add the widget to a home screen, go to Apps > Widgets. Touch and hold Assistive light, and then place the widget on your desired screen."