One of the major difficulties for those who produce indoor scenes is regular and adjust the lighting of a particular scene.
The many variants, some points of light may in most instances produce excessive light, bursting at certain points.
In most renderers, unless you have a lot of skill (luck), you can not regulate everything easily in the first image, thus needing to produce multiple images and this time goes by ...
In Thea render with the Relight tool, it is possible to render the same, producing various lighting scenarios, and changing or deleting light sources in the scene.
This class that I am offering is part of the course Thea Render Studio to be released on Monday the 07.14.2013.