Lowel Rifa LC-55eX eXchange-Lite, 120-240VAC, 21" x 21" Collapsible Soft Light System The Next Generation of Rifa... You've loved Rifa's compact portability, 60 second setup, & beautiful output. Now, with the Lowel Rifa eXchange System, Lowel added versatility! All 4 original Rifa-lite models have been updated to create the Lowel Rifa eXchange System. Quick-exchange push & twist lampheads.