Lighting Problem

Hey Guys!
So I´m working on my very first “game”. I´ve recently run into some problems with the lighting. As you can see by the pictures linked below there is a noticeable change in the brightness (They are two different scenes). The problem occurred when i wanted to add another scene or level into my game. The lighting in the first level just became brighter all of a sudden. I appreciate all help! Thank you.

The lighting hasn’t been ‘built’ in the second scene, thus leaving out things like ambient lighting, reflections, etc. To do this, simply open the “Lighting” menu and press “Build” at the bottom of the window.