On Mon, 11 Dec 2006, Jan Hollan wrote:

>
> Cinzano's definition (explained in broad e.g. at
>  http://savethenight.eu/What%20is.html, together with the necessary
> measures to stop its rise; some printed reference should be supplied too
> in the EuP document) is the only tenable. Reformulating it once more,
> it is
>
>    alteration of those levels of light, which would be present naturally