So, you can dispel invisibiltiy, skins, blur a all that. But I notice that "/c dispel light" does nothing. It would be nice to dispel light with out the use of dispel magic spells.

Light can be an offensive spell, so it's not viable to disable it like you would any other 'buff'. You can use it to put -10 hide on enemy scouts, and to blind/harm Drow PCs.

trendy nailed it on the head.