r_flashlightfov
r_flashlightfov is a console variable available in all 
Source games.
It can be used to set the amount of screen space illuminated by player's flashlight. Syntax: r_flashlightfov <int> Default: 45.
Examples
r_flashlightfov 170- Flashlight illuminates the entire screen
r_flashlightfov 1- Flashlight illuminates only a small dot
