Normal families decorate their houses, and of course, large supermarkets put great decorations around there.
However, there was a big accident happened this march: tsunami. Atomic power plants were destroyed, furthermore, large number of people were killed by it. Because of the disaster, Japanese people think we shouldn't enjoy Xmas so much and have to save power as we can possible.
Then, supermarkets try to do some devices. Of course they use LED lights. I heard, furthermore, one of the popular supermarkets cut CDs in star shape and put as decorations. It's for reflect lights and shine using less light bulbs.
These devices are not only good for people minds but also environment.