How Do I Make A Map Completely Dark?

I Wanted To Be As Dark As In The Game Slenderman's Revenge, Where You Need A Flashlight To See

Go to Lighting in the Explorer Bar and everywhere where you see a color changer change it to 0,0,0 (Aka Black)

Make sure all questions are related to ROBLOX Lua scripting -from the community guidelines. Sorry for being a snob, just make sure you look at the guidelines and consider them next time.