Mise-En-Scene

Mise-en-scene is everything in the scene including: lighting, propps, costume, characters, and dialogue.
Everythign in the scene is created or there for a reason to make it work.
Lighting is especialy important as this can set the mood in the scene including making it sceme romantic or scary ormaking someone seem upset or happy. This is done by changing the brightness of the key light, fill light and backlight to create different shadows and effects. you can get harsh or soft lighting and ambient lighting.

Filters can also be used to create mroe of a moof for example a red filter could be used to make the scene look more dangerous or bloody or it can be used with high lighting for a romantic effect.

In across the halls short film the filter red and green are used. I think the red is to suggest danger as he is goign to kill someone.

In the decent I think the green filter is used to create a sci-fi look as the monsters look like aliens and we associate green with aliens. A red filter is used to create a dangerous bloody look.