The Lowel Rifa eXchange Fluorescent Three Lamp Module Accessory Pak is a push-turn head for the redesigned Rifa-EX softbox lights. As supplied, it is suitable for use in all except the Rifa-EX 44 boxes. The idea behind this is versatility. Choose this module for your Rifa-EX 88, 66, or 55 softbox light. It is designed with three standard Edison screw bases for the included screw-in fluorescent, or optional low-wattage incandescent bulbs.