This video covers the process of lighting and rending an interior scene in Houdini.
In this video we take a look at a variety of topics such as Portal Geometry, adding GI lights to calculate secondary bounces, optimizing the global illumination and manually adding bounce lights to better light up the scene.
You can download the scene file from the link given below. It's a fairly large file ( 48 mb) so I uploaded it to google drive. I hope it works.