Most department stores have been using overhead florescents for years, and I can't imagine why they would switch to compact florescents which are less efficient and cost more.
There are new department-store-level lighting solutions that will save them a lot of money, but it's not compact florescents. My brother just got into the business selling new efficient lighting solutions to businesses, so next time I see him he should be trained enough I can ask him what they are doing, I'm guessing some LED lighting and some newer florescent and maybe even fiber optic lights.
I think that the eyes which effected me were more halogen in their brillance. They make everything in \a store brighter, whiter, and cause alot of glare.