Were you looking for the Funtime Auditorium alternative, the Flash Beacon?
The Flashlight is a mechanic in FNaF: SL. It's used as a light source in Ballora Gallery, Under The Desk, and Parts/Service.
Role in Sister Location
In Night 2, the player will need the flashlight to look for Bidybab through the holes Under The Desk. It is also used to navigate through Ballora Gallery into the Breaker Room. The light is strangely large for a flashlight, however.
In Night 3, the player will need to use the flashlight in Parts/Service to observe Funtime Freddy and navigate him for the required buttons that need to be pushed.
In Night 5, the flaslight is used to observe Circus Baby and to click certain buttons on her and in the Parts/Service.
The Floor of Ballora Gallery being lit up by the flashlight.
The flashlight being used to find Bon-Bon hiding behind Funtime Freddy.
The flashlight being on Bon-Bon's face when it jumpscares you.
The flashlight shining on Bidybab when it jumpscares you from Under The Desk
The last frame of Bidybab's jumpscare from under the desk.
Flashlight shining in Parts/Service.