The japanese tank that I have seen use more of an "accent lighing" style than we use here. We use large bulb, large output lighting systems to light the entire tank equally, whereas some of the japanese systems I've seen use more of a "spotlight" effect. They have dedicated spots on their corals. Provides more targetted lighting, plus allows for better color rendition. Some corals look better under different "colored" lights, and this type of system allows each major coral to be "highlighted" differently.
A more complex system, to be sure, but visually pretty appealing...
FWIW,
Kevin