Reminds me of Half-Life's intro. It happened when your train came near that lights went on.
However, since you can only have 3 different light-styles on a wall
(Think about why: rad generates lightmaps that in fact are a sort of layer over your normal textures, so they look lit. For an animated light, one that turns on and off, you need two lightmaps. Therefor you want to limit the amount of different light-styles, as with each animated light you're rapidly increasing the amount of lightmaps you have to generate.) you should either increase the distance between the lights, or count several lights as one (naming them the same causes them to have the same style, thus it lowers your change of hitting the limit). Also breaking up the wall, floor and ceiling into more, smaller faces can help (as lights may be out of reach for them, where they wouldn't have been when the wall was one large face.
Kol, your texture-toggling idea in fact happens with lightmaps, but that has a limit somewhere. And so would texture toggling have its limits in that you can't get the light effect to reach too far on a wall, or you would have to toggle between a whole lot more textures...
![:)](http://192.241.182.11/images/smilies/smile.png)