I only know of a couple of mods that affect the Propylon chambers: stormless' http://planetelderscrolls.gamespy.com/View.php?view=Mods.Detail&id=2231 and cdcooley's Propylon Lighting, the latter:
On low-end machines, the particle effects in the Propylon Chambers can reduce FPS levels to below those seen even in Balmora. This plugin uses a mesh by Starcon5 and some new (oridinary) lighting to make the Propylon Chambers less FPS intensive and still not too plain. This changes the Platforms, a few lights, and nothing else.
It's only available from the Internet archive at the moment. http://web.archive.org/web/20070205014548/http://home1.gte.net/cdcooley/PropylonLighting1.0.zip.