Earlier I was told that there was something wrong with Claralux, so I had a look. Yep, from what the posts on Nexus say Claralux is indeed totally busted! So, anyone know of a good replacement for Claralux?

Not exactly the same, but depending on what you're looking for there's http://skyrim.nexusmods.com/mods/41177/? and http://skyrim.nexusmods.com/mods/18916//?.

If you're looking for brighter lights or extended light radii, there are a number of mods, just search for bright light on nexus. There's also a recent update to a script-based lighting mod (it dynamically adds real light sources to various places around Skyrim) with a thread here, but I couldn't find it.