Ok so what I have done is used a image space to get my room as dark as possible without looking rubbish. But now I found a prefab that allows you to turn lights on an off. Trouble starts when I use the base "RemovableTorchSconce01"
It turns off an on just fine if you do it manually, but the trouble is, I want it to be on a trigger so when you do something in the room that releases a horde of undead around you, the room goes pitch black, an all you can hear is the NPC's... Now its all but impossible to manually turn them all on again because it seems to delete the torch itself from the holder.

So what I was thinking was to use a sconce instead. Trouble is no matter what I do, I cant get it to turn off an on. I have copied the "Linked Reff from the holder to the DefaultTorch01NS_Fast01,then Reff linked DefaultTorch01NS_Fast02.But it just wont work. I know I am missing something, but for life of me I dont know what.

The latest thing I did was to set a stone button in floor in darkness so when you stand on it, all the lights go out an you have to light a torch. But you can spend all day jumping up an down on the damn button after that an it wont do a thing lol. (I tried this for a good 10 mins before it clicked why)

http://www.youtube.com/watch?v=2kX0LNvPI6w&feature=youtu.be

There is dungeon in skyrim which uses exactly this script/system.When you enter the hall light turns off and draugr's rise from graves. And when you kill draugr's light turns on. Sorry I dont remember the name but if you find that dungeon, thats exactly what you are looking for I quess...

I try to check if I find the dungeon myself, and I'll update then...

oh magic, cheers mate, I will do a search myself too it's probably where I got the idea from lol...