Adding light to a clip in After Effects

I have a clip of a house filmed from the outside, where we can see a window. I’m trying to add some light to make it look as is there was a light inside the room of the window when we filmed it. Is this possible? Can anybody tell me how to do it?

via Video Editing Forums: Digital Director – Adobe Premiere, Premiere Elements, and After Effects http://ift.tt/1iSsrsz