What is the app for the Assistive Light in Samsung Smartphones?

[AC Question]

I would like to install, if at all possible, the app that controls that Assistive Light in Samsung Smartphones (S3 & S4 that I know of) on another phone with JellyBean 4.1.2, but I do not know what it is called, even if it is a system app. I could "extract" it from an S3 if someone would give me a clue as to what to look for.
Thank you in advance.
Cheers,
Alphonse