Second Project -> Simulating radiosity

First step is create a room whit color walls.. in this case red in left and green in right side ... i added a texture in the ground just to enrich the scene ...

then I create a new light in room model . You can position it anywhere ...

create a new action and then you must position light in correct place, in this case in the red wall edge, set light color to red... then in frame #100 drag light until green wall edge and set light color to green...

You can download a zipped file which contains model and action here

Create a new Cho, delete all lights and ground import room model and put some props inside it .... relocate camera ....
Import room model and action ....

in action properties under CHO set lenght = 1 and repeat = 100
in rendering options set passes = 100 (10x10) and motion blur = 100%

Voila !!!!!