I really have decent difficulties with a light background. For example i cannot read a text on a white bg on the screen. It hurts my eyes. Furthermore i think that images (and its colours for sure) seems to appear more brilliant and clear on a dark bg (on my website all images are on a dark background) ... When i fall upon a website which is too bright i tend to go away very quickly - automatically and without thinking about. So it would be great to keep at least the possibility for everybody to choose...