Question: Since lightsabers give off a visible glow, I could see a Jedi or a Sith using their lightsaber as a lighting source. They were already used as tools (at least in Episode I) so there are some non-violent uses to a lightsaber. Has any Jedi or Sith used their lightsaber in this manner in canon works?

Answer: 
In Star Wars the *Clone Wars*, Series 2 episode seven, "Legacy Of Terror" Anakin and Obi-Wan use their lightsabers to give off light when they are descending into the catacombs. The Clone Troopers who accompany them use in-built lights on their helmets.

<http://starwars.wikia.com/wiki/Legacy_of_Terror>

![S02E07 "Legacy of Terror" lighting the catacombs](https://i.stack.imgur.com/tifMQ.jpg)
In *The Clone Wars: [Weapons Factory](http://starwars.wikia.com/wiki/Weapons_Factory)* (S02E06), Barriss Offee and Ashoka Tano use their sabers to provide light when they are trapped beneath some rubble.

![Barriss & Ashoka](https://i.stack.imgur.com/XYTq8.jpg)

In the following episode, *[Legacy of Terror](http://starwars.wikia.com/wiki/Legacy_of_Terror)* (S02E07), Obi-Wan and Anakin use theirs to provide light as they descend into a temple. 

![Obi-Wan & Anakin](https://i.stack.imgur.com/cffqH.jpg)

![Obi-Wan & Anakin](https://i.stack.imgur.com/8u7Tc.jpg)