A newly uncovered Nintendo patent reveals an external lighting device for the Wii that reacts instantly to how you play certain games. Of course, mood lighting technology is not uncommon today, however, it's application in video games has barely been touched upon with only Sony using it slightly with it's PlayStation Move device.
Nintendo's "Wii Light" is a external portable mood light that is able to display up to 256 different colours at varying intensities. The patent, devised sometime in 2009, mentions applications for the technology, which include shooting on targets in a FPS's, and highlighting special attacks in fighting games. Wii games could also be set to vary the lights, colours, intensity and special effects on specific button presses. Nintendo also proposes the "Wii Light" could be used to match a game's BGM, by composing colour and intensity displays in a way that suits a games music.