First came the rumors that the Wii's sensor bar would not work well under halogen lights, and now a poster over on Nintendo's official forums claims that it doesn't work well in direct sunlight either.

Supposedly, the poster played the Wii at Nintendo World on September 14th (during the company's conference to reveal the date and price of the machine). During that time, kiosks placed near the store's windows encountered problems as the sun shone directly inside the store. He commented:

For about an hour or so, the sun shone right into the store, the two MP3:C kiosks had to have curtains above them, and the Wii Sports Tennis and Shooting Game kiosks were unplayable since they were "shrouded" in sunlight. Later the sun went behind a building, and everything was in working order again. So when you get your Wii, don't play it in the sunlight. Or keep the sensor bar and TV away from the windows.

The question is, how intense was the sunlight during that hour or so? We already know from official comments that Nintendo has had problems with both flourescent lighting and natural sunlight during development, although the company has supposedly ironed out those by now. So if this occurred during a period of intense natural sunlight (magnified by the glass in the store's windows), that would not be a big surprise.

Most likely it's only intense sunlight that causes an issue, which wouldn't be a concern for most home setups regardless due to the fact that people tend to point their TV sets away from sources of light (or else deal with nasty glare) anyway.