How to add lights to an interior scene in Blender Cycles?

The use of Cycles for architectural modeling is really cool to see an almost realtime feedback of your modeling. My previous article on the blog just showed how to do that in Cycles. But, a lot of people send me messages asking more about how to deal with lights in Cycles. How can we add lights to an interior scene? Well, the best way to add light sources in Cycles is with mesh-based lights. This is actually really simple to use, and to show you again a small demo of a quick application of Cycles for architecture, the video below will show how to add those lights to an interior scene.