Has someone any idea how to make an animating spotlight

The question is not how to make an animation,
but is it possible by making a volumetric light with a volume and assigned material like in this example

By animating it you can make a animating spotlight like a lighthouse or a flashlight.
To show what I mean: below is a link to an example of how it is done in Artlantis (pardon my French

http://www.youtube.com/watch?feature=pl ... QQvKufECiM
greetz,