For those Android smart-phones where there is no default app and option to keep the screen always turn on, this app is to fill that need. Use case for such needs include retailer who like to show-cast the latest Android smart-phone, they need to keep the display set screen always turned on to attract walk-in customers attention, similar concept like TV display set. For those driving, you dock your phone and you want it to always turn on to look at those apps with directions as and when you get lost in some foreign places etc.
To configure, long tap on Home screen -> Widgets -> Light On. Four shapes in a line appear. Tap Dim,Bright,Brightest,Off. Their name indicate their function. After which you can start to activate your other apps and use them with the screen remaining turn on until you tap Off.
IMPORTANT:
If you are also running other apps that hold a lock to keep the screen on, tapping on the Off widget will not turn the screen off. It can only turn off those previously tap