So I installed "Redesigned Vivec" from http://www.pirates.retreat.btinternet.co.uk/Vivec.htm and the lanterns are positioned wrong.
Like this: http://img6.imagebanana.com/img/dvbsuc20/Morrowind.exe0104304.png
Is there an updated version anywhere or am I just doing it wrong? :unsure: :
Already repaired my savegame, because I used "vivec open air plazas" before and regenerated distant land (ticked the esp).

€dit:
Figured it out. It's "Illuminated Windows".
Sorry. :facepalm: