Just downloaded and installed the latest MSE V2 Los Angeles and San Diego Ultra Res and there's night lighting in the LAX area at least. The regular MegaScenery MSE V2 scenery released for California did not have very good night lighting and, in fact, it was blocky and really ugly. Here's a couple pictures to show the night lighting near Los Angeles:
EDIT: this is with MegaSceneryX SoCal also enabled and sitting under the Los Angeles/San Diego entry in the Scenery Library.
Best regards,