Lightning in unity?

Hey guys! I am new in Unity and i don't know much about lights. So I'm making a game, which atmosphere will be like Portal 2. I want to make the lights something like that, but i don't know much about them, and my lights a bit buggy or something like that, but i don't know how should I fix it.

So my light seems like this: My question is: How can i make led or just simple lights like this lights: So, how can i make a closed box much lighter and fix my lights or make something better?