Textures glow but dont throw off light

[Snitzel]

I'm using lights from some of the default texture packs that come with nexuiz. I insert the lights, some are dull, some glow but none trow off any light into the map. Why?

[sev]

It would be useful to post which specific textures you mean.

Anyway, most light textures use a glow map (texturename_glow.tga), but not all of them also use a script that makes them emit actual light.

In that case, you need to put in light entities into your map yourself. You also can use "target_position" entities to give the light entities a direction (i.e. converting them to spotlights).