Normally, I think there are not so many lights in Hallstatt. But as the day I visited it, they had a concert right in the middle of the city (the very bright light in the middle, was a boat with a orchestra on it :)), and they strung light all along the walkway. Other than that, the surrounding is really dark, as its only mountains. You can see it also from the EXIF info, that I had to go with a high ISO and a bigger aperture than I usually like.
This is a HDR from 3 exposures, created in Oloneo Photoengine, finished in Photoshop.