Even with a lot of external render engines available for Blender, like YafaRay and LuxRender we may at some point have to setup the render of a scene using only the internal render. With the internal render we loose all that quick setup, and advanced features to add global illumination to a scene. But, it doesn`t mean that the scene won`t look good with the internal render setup.
And what about a day/night setup? Well, that`s what you will find in this quick tutorial from Ben Amend, where he points a quick way to create a day and night light setup for Blender, using only the internal render engine.