IT's not a big deal, but I thought I'd mention it in case other players are also puzzled by the light cantrip not working.
I installed some fancy camp clothes mods and thus often have the "hide armour from view" toggle set on.
I also used to cast the ligth cantrip on Lae'zel in dark places with loot, so I don't have to scan the screen with the mouse, but can just see the environs.
Well, it turns out that when you have this light on you and you hide the armour from view, the light disappears also, so once agrain find yourself groping around in the dark. Even though the cantrip is still active. Toggling armour visibility back on also brings the light back.
